Q: What is the purpose of the left knob on the COINTRA COB 14 p boiler?

The left knob of your COINTRA COB 14 p boiler is the gas control . It allows you to manually select the burner power and thus controls the intensity of the water heating. Operation Small flame position : reduces the power by about half. Consumes less gas and produces less hot water. Large flame position : operates at full power. Heats the water to the maximum. Intermediate positions : you can also position the knob between these two extremes to adjust the intensity to your needs. The right knob, on the other hand, allows you to adjust the water temperature by turning it to the right (increases) or to the left (decreases). Both controls work together to provide you with the desired thermal comfort.

Q: How to regulate the hot water temperature on the COINTRA COB 14 p boiler?

Your COINTRA COB 14 p boiler has a temperature selector on the control panel that allows you to easily regulate the hot water temperature. Instructions Turn to the right to increase the temperature Turn to the left to decrease the temperature This selector works in tandem with the left knob (gas control that regulates the burner power). The boiler has a temperature adjusting thermostat that automatically regulates heating based on your settings. Note: Hot water flow rates vary according to temperature. For example, you get 13.7 l/min at 40°C and 6.8 l/min at 65°C, which is normal for this model.

Q: What does the error code EE mean?

The error code EE on your Cointra COB 5 b x instant gas water heater indicates a . This code disables the device for safety reasons and prevents the correct display of the temperature. Main causes: Faulty temperature sensor : The sensor that measures the water temperature is damaged or is no longer communicating properly. Loose electrical connections : The sensor wires may have disconnected inside the device. Insufficient water flow : A low flow rate can trigger this code if the sensor detects an abnormal temperature. Overheating : If the water becomes too hot (beyond the safety limit), the EE code will appear. Troubleshooting steps: Turn off the device by turning the gas knob to the off position. Wait a few seconds, then briefly press the reset button once if your model is equipped with one. Check that the incoming water pressure is sufficient (minimum 0.2 bar for proper operation). Ensure that the water flow is appropriate: for this model 5 l/min, at least 0.5 bar is required at 40°C. Visually check for any limescale buildup around the temperature sensor. If the EE code persists after these checks, the temperature sensor will likely need to be replaced. Contact Cointra technical service at +34 916 707 459 (Spain) or your local distributor for qualified assistance. Do not attempt to replace the sensor yourself: only an authorized technician should handle the internal components of the water heater to ensure your safety and maintain the validity of the warranty (3 years).

Q: What should I do if my COINTRA Supreme B boiler does not turn on?

If your COINTRA Supreme B water heater does not turn on , start by immediately closing the hot water tap. The device is equipped with an ionization electrode that detects the presence of the flame. When the burner does not ignite or goes out, it usually indicates a problem with the gas supply or flame detection. Check the following items in this order: make sure that the gas supply valve (located on the gas connection to the device) is open. Check that the 1.5 V batteries are correctly installed in their compartment with the correct polarity (+ and -), as the water heater operates with battery-powered electronic ignition. Finally, check that the propane or butane gas bottle is not empty. After checking these points, close the hot water tap and then reopen it. The ignition electrode will produce an intermittent discharge that should trigger the burner ignition. If the burner still does not ignite after opening the tap, close it again and wait a moment before repeating the operation a second time. If the issue persists after these attempts, it is possible that the ignition electrode is defective or that there is a problem with the ionization control system. Then contact COINTRA Technical Support. Do not attempt to repair the device yourself: only a qualified technician is authorized to intervene on the Supreme B to ensure your safety. In case of prolonged shutdown during winter, remember to drain the water from the circuit to avoid damage due to freezing. The error codes displayed can also help you: a flashing symbol indicates that the burner is trying to operate, while a steady symbol indicates a low or dead battery.

Question 1

What is the purpose of the left knob on the COINTRA COB 14 p boiler?

Accepted Answer

The left knob of your COINTRA COB 14 p boiler is the gas control. It allows you to manually select the burner power and thus controls the intensity of the water heating.

Operation

Small flame position: reduces the power by about half. Consumes less gas and produces less hot water.
Large flame position: operates at full power. Heats the water to the maximum.
Intermediate positions: you can also position the knob between these two extremes to adjust the intensity to your needs.

The right knob, on the other hand, allows you to adjust the water temperature by turning it to the right (increases) or to the left (decreases). Both controls work together to provide you with the desired thermal comfort.

Question 2

Why is my COINTRA COB 14 p boiler suddenly producing cold water?

Accepted Answer

If your COINTRA COB 14 p boiler is suddenly producing cold water instead of hot water, several causes may explain this:

Priority Checks

Dead Batteries: The boiler operates with 2 LR20 (1.5 V) batteries that power the electronic ignition. Check that the batteries are not depleted and are installed correctly. Replace them with new LR20 batteries.
Gas Valve: Ensure that the gas shut-off valve has not been accidentally closed. Make sure it is in the open position.
Gas Supply: If you are using a gas bottle, check that it is not empty.
Water Pressure: The boiler requires a minimum water pressure of 0.4 bar to operate correctly. If the pressure is too low, the electronic ignition will not occur.

T.T.B. Safety System

Your boiler has a T.T.B. system that cuts off the gas supply if the combustion products are not properly evacuated. If this system has been triggered, the boiler will no longer heat the water. Check that the flue gas exhaust is not blocked.

Ionization Probe

An ionization probe continuously checks for the presence of the flame. If the flame is not detected, the boiler automatically generates new sparks. If this system detects an anomaly, it cuts off the heating for safety.

Mandatory Maintenance

The manual recommends a complete annual maintenance by the Official Technical Service. Internal fouling or deterioration of components can reduce heating capacity. Contact the official technical service for a complete diagnosis.

Question 3

How to regulate the hot water temperature on the COINTRA COB 14 p boiler?

Accepted Answer

Your COINTRA COB 14 p boiler has a temperature selector on the control panel that allows you to easily regulate the hot water temperature.

Instructions

Turn to the right to increase the temperature
Turn to the left to decrease the temperature

This selector works in tandem with the left knob (gas control that regulates the burner power). The boiler has a temperature adjusting thermostat that automatically regulates heating based on your settings.

Note: Hot water flow rates vary according to temperature. For example, you get 13.7 l/min at 40°C and 6.8 l/min at 65°C, which is normal for this model.

Question 4

What does the error code EE mean?

Accepted Answer

The error code EE on your Cointra COB 5 b x instant gas water heater indicates a . This code disables the device for safety reasons and prevents the correct display of the temperature.

Main causes:

Faulty temperature sensor: The sensor that measures the water temperature is damaged or is no longer communicating properly.

Loose electrical connections: The sensor wires may have disconnected inside the device.

Insufficient water flow: A low flow rate can trigger this code if the sensor detects an abnormal temperature.

Overheating: If the water becomes too hot (beyond the safety limit), the EE code will appear.

Troubleshooting steps:

Turn off the device by turning the gas knob to the off position.

Wait a few seconds, then briefly press the reset button once if your model is equipped with one.

Check that the incoming water pressure is sufficient (minimum 0.2 bar for proper operation).

Ensure that the water flow is appropriate: for this model 5 l/min, at least 0.5 bar is required at 40°C.

Visually check for any limescale buildup around the temperature sensor.

If the EE code persists after these checks, the temperature sensor will likely need to be replaced. Contact Cointra technical service at +34 916 707 459 (Spain) or your local distributor for qualified assistance. Do not attempt to replace the sensor yourself: only an authorized technician should handle the internal components of the water heater to ensure your safety and maintain the validity of the warranty (3 years).

Question 5

What should I do if my COINTRA Supreme B boiler does not turn on?

Accepted Answer

If your COINTRA Supreme B water heater does not turn on, start by immediately closing the hot water tap. The device is equipped with an ionization electrode that detects the presence of the flame. When the burner does not ignite or goes out, it usually indicates a problem with the gas supply or flame detection.

Check the following items in this order: make sure that the gas supply valve (located on the gas connection to the device) is open. Check that the 1.5 V batteries are correctly installed in their compartment with the correct polarity (+ and -), as the water heater operates with battery-powered electronic ignition. Finally, check that the propane or butane gas bottle is not empty.

After checking these points, close the hot water tap and then reopen it. The ignition electrode will produce an intermittent discharge that should trigger the burner ignition. If the burner still does not ignite after opening the tap, close it again and wait a moment before repeating the operation a second time.

If the issue persists after these attempts, it is possible that the ignition electrode is defective or that there is a problem with the ionization control system. Then contact COINTRA Technical Support. Do not attempt to repair the device yourself: only a qualified technician is authorized to intervene on the Supreme B to ensure your safety.

In case of prolonged shutdown during winter, remember to drain the water from the circuit to avoid damage due to freezing. The error codes displayed can also help you: a flashing symbol indicates that the burner is trying to operate, while a steady symbol indicates a low or dead battery.

Question 6

Why does hot water replace cold water after changing the batteries on a COINTRA CADI 11L CPA water heater?

Accepted Answer

After replacing the batteries of the COINTRA CADI 11L CPA, the issue of hot water replacing cold water generally indicates a malfunction of the electronic system powered by the batteries. These 1.5 V batteries control not only the electronic ignition of the burner but also the magnetic valve of the hydraulic circuit that regulates the flow of hot and cold water. A poor installation during the replacement may therefore interrupt this control.

First, check the battery installation: Open the battery compartment (see figure 15 in the manual) and ensure that the batteries are installed with the correct polarity (+/-). The battery charge symbol on the control panel should display a clear indication. If the symbol is flashing, the batteries are completely discharged and must be replaced immediately. Make sure that the new 1.5 V batteries are of good quality and properly seated in their housing.

Perform a complete system reset: close the main gas valve located on the gas connection to the appliance, then turn off the appliance by pressing the control button. Wait about 3 to 5 minutes to allow the electronic system to fully reset, then turn the appliance back on by reopening the gas valve and turning the knob to the desired temperature level. Test by first opening a cold water tap, then gradually opening a hot water tap to check that the transition occurs correctly.

If the problem persists after these checks, it is possible that the magnetic valve of the hydraulic circuit is damaged or that the flame detection system (ionization electrode) is faulty. Also, check that the hot and cold water pipes have not been reversed during a previous installation. As a last resort, contact a qualified technician for inspection and repair, as only authorized personnel can intervene on the electronic and hydraulic components of this appliance.

Question 7

Why does the burner of my COINTRA CETI water heater ignite and then immediately go out?

Accepted Answer

When the burner of your COINTRA CETI water heater ignites and then immediately goes out, it generally corresponds to error E1 (ignition failure) or E2 (abnormal flame presence) in the device's self-diagnostic system. This issue has several possible causes that require methodical checks before calling a certified technician.

First, check the gas supply. Ensure that the gas supply valve is fully open and that the gas pressure is correct. According to the technical manual, the supply pressure should be 20 mbar for natural gas (G20), 25 mbar for G25, 29 mbar for butane (G30), and 37 mbar for propane (G31). Insufficient pressure prevents the burner from staying lit. Additionally, check that all gas connections are airtight using a soapy water solution to detect any leaks.

Examine the flame detection electrode. This is the key element that keeps the gas lit after ignition. According to the manual, the electrode should show no deposits (scale) and must be properly positioned. If it is dirty or misaligned, it will not detect the flame, and the gas valve will close immediately. Cleaning the electrode and burner is a recommended annual operation: use a soft cloth or a non-metallic brush to gently remove deposits. Never use aggressive chemicals or steel brushes to avoid damaging these sensitive components.

Check the ventilation and air intake. Poor ventilation or blocked air and flue ducts prevent proper combustion. Ensure that the air intake and flue exhaust are not blocked by debris, dust, or external elements. The CETI water heater is equipped with a fan that works in conjunction with the burner; if the latter is malfunctioning, combustion will be unstable.

Check the condition of the burner and the heat exchanger. If the burner or heat exchanger contains dirt or scale, it disrupts combustion. Clean them gently with a damp cloth, without abrasive products. Finally, completely fill the hydraulic system and check that there is no air in the circuit or in the device, as this can also affect operation.

If after these checks the problem persists, the device will likely display error code E1 or E2 on the screen. You can consult the error history by pressing the “ – ” button for 5 seconds from STANDBY mode. If the burner still goes out immediately, contact a certified COINTRA technician, as this may indicate a problem with the electronic board, gas valve, or control system that requires professional intervention. Reminder: annual maintenance performed by a certified professional helps prevent this type of malfunction.

Question 8

What does error code E3 mean on the COINTRA CADI 11L CPA water heater and how can it be resolved?

Accepted Answer

The error code E3 on the COINTRA CADI 11L CPA water heater generally indicates a problem related to water temperature, often caused by a malfunction of the temperature sensor or a risk of overheating.

Possible causes of error code E3:

Failure or malfunction of the temperature sensor.
Abnormally high water temperature (overheating).
Electrical supply issue affecting the thermostat operation.

Steps to resolve error code E3:

Check the power supply: Ensure that the water heater is properly powered and that the circuit breaker has not tripped.
Restart the device: Turn off the water heater, wait a few minutes, then turn it back on to see if the error disappears.
Check the temperature settings: Ensure that the set temperature is not set too high, which could cause overheating.
Inspect the temperature sensor: If you are competent, examine the sensor for any faults, poor connections, or damage. Otherwise, consult a professional.

If after these checks the E3 code persists, it is recommended to contact a qualified technician for a thorough diagnosis and appropriate repair.

Question 9

What should I do if my COINTRA CADI 11L CPA water heater does not turn on?

Accepted Answer

If your COINTRA CADI 11L CPA water heater does not turn on, here are several checks and steps to follow to identify and resolve the issue:

1. Check the power supply

Make sure the water heater is properly plugged into a functioning electrical outlet.
Test the outlet with another device to confirm it is working.

2. Check the circuit breaker

Check if the circuit breaker or fuse corresponding to the water heater's electrical circuit has tripped or blown.
If so, reset the circuit breaker or replace the fuse.

3. Adjust the thermostat

Ensure that the thermostat is set to a sufficient temperature for the water heater to turn on.
A thermostat set too low may prevent the device from turning on.

4. Check the indicator lights

If your model is equipped with an indicator light, observe if it lights up when you attempt to turn on the water heater.
A light that is off may indicate an electrical problem or an internal fault.

5. Other points to consider

Ensure that the water supply is open and that the water heater is properly installed.
An internal fault or failure may require the intervention of a qualified professional.

By following these steps, you can often identify the cause of your COINTRA CADI 11L CPA water heater not turning on and take appropriate measures to get it functioning again.

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