Greenstar 42CDi Classic - Chauffe-eau et chaudière Worcester - Free user manual and instructions
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| Product Type | Condensing Combination Boiler |
| Brand | Worcester |
| Model | Greenstar 42CDi Classic |
| Category | Water Heater and Boiler |
| Fuel Type | Natural Gas or LPG (convertible) |
| Central Heating Output (max) | 42 kW |
| Domestic Hot Water Output (max) | 42 kW |
| DHW Flow Rate (ΔT 35°C) | 17.3 L/min |
| Efficiency (SEDBUK 2009) | A-rated (approx. 90-92%) |
| Dimensions (H x W x D) | 850 x 450 x 400 mm |
| Weight | 43 kg |
| Gas Connection | 22 mm compression |
| Water Connection | 15 mm compression (CH flow & return, DHW inlet & outlet) |
| Electrical Supply | 230 V / 50 Hz |
| Control Type | Analog thermostat (optional digital/programmable) |
| Ignition | Electronic auto-ignition |
| Flue Type | Twin pipe (60/100 mm) or vertical / horizontal |
| Safety Features | Overheat cut-off, frost protection, pressure relief valve, flame failure device |
| Maintenance | Annual service recommended by a Gas Safe registered engineer |
| Warranty | Standard 2 years (extendable) |
| Spare Parts Availability | Available through Worcester-approved suppliers |
Frequently Asked Questions - Greenstar 42CDi Classic Worcester
How do I reset the Worcester Greenstar 42CDi Classic boiler?
To reset the boiler, press and hold the reset button (usually illuminated red) for 3 seconds until the light goes out. The boiler will restart automatically. If the fault persists, consult the manual or call a qualified engineer.
Why is my boiler losing pressure and how do I repressurise it?
Loss of pressure is often due to a leak in the system or recent bleeding of radiators. To repressurise, locate the filling loop (usually a flexible hose with two valves), open both valves slowly until the pressure gauge reads 1.0-1.5 bar, then close both valves tightly. If pressure drops frequently, check for leaks.
Why is the boiler not lighting or igniting?
Possible causes: no gas supply (check other gas appliances), low water pressure, or a locked-out fault code. First check the pressure gauge. If pressure is low, repressurise. If the boiler shows a fault code, refer to the manual or reset it. If the problem continues, contact a Gas Safe engineer.
How do I adjust the temperature for heating and hot water?
The boiler has two temperature dials: one for central heating (radiator icon) and one for domestic hot water (tap icon). Turn the relevant dial clockwise to increase temperature, typically between 40°C and 80°C for heating, and 35°C to 65°C for hot water.
What do the error codes on my Worcester Greenstar 42CDi Classic mean?
Common codes: F1 (low pressure), F2 (overheat), F4 (flame failure). Refer to the fault code section in your manual. Most codes require professional inspection. Do not attempt repairs yourself unless qualified.
How often should I service my boiler?
An annual service by a Gas Safe registered engineer is recommended to maintain efficiency and safety. The service includes checking flue, heat exchanger, burner, and safety devices.
Can the boiler work during a power cut?
No, the boiler requires electricity to operate the pump, fan, and controls. During a power cut, the boiler will not function. However, the boiler has frost protection that may activate if the system temperature drops too low, but only if power is available.
What type of flue does the Greenstar 42CDi Classic use?
The boiler uses a twin pipe flue system (60 mm flue gas, 100 mm air inlet) suitable for horizontal or vertical termination. Ensure the flue is installed according to regulations and not blocked.
Is the boiler compatible with smart thermostats?
Yes, the Greenstar 42CDi Classic is compatible with many smart controls, such as Worcester's own Wave or Bosch's EasyControl. Connection is typically via a 24V volt-free interface or OpenTherm. Professional installation is recommended.
How do I drain the heating system?
To drain, ensure the boiler is off and cooled. Locate the drain valve (usually at the lowest point of the system). Attach a hose, open the valve, and open bleed valves on radiators to allow air in. Never drain with the boiler on. For full system drain, consider hiring a professional.
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