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.

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