Immergas Appliance Repair in St Thomas

What does the 425 error mean on an Immergas heat pump?

The 425 error on an Immergas heat pump indicates a supply voltage phase loss. This error applies only to three-phase models and indicates one of the electrical supply phases has been lost. Switch off the heat pump at the isolator switch immediately. Do not attempt to restart. Contact a qualified electrician to check the three-phase electrical supply. Operating with a missing phase can cause serious damage to the compressor motor.

What does the 02 error mean on an Immergas boiler?

The 02 error on an Immergas boiler indicates the safety thermostat has activated due to overheating. The boiler has detected excessive internal temperature exceeding 100 degrees Celsius. Switch off the boiler at the electrical supply. Allow the boiler to cool down completely for a minimum of 60 minutes before attempting any reset. Check that all radiator valves are open to ensure adequate water circulation. If the error returns after cooling and reset, contact a qualified technician immediately as repeated overheating can indicate serious internal faults.

What does the 24 error mean on an Immergas boiler?

The 24 error on an Immergas boiler indicates a push button control panel anomaly. The main circuit board has detected a fault with the user control panel. Switch off the boiler at the electrical supply. Wait 30 seconds and switch back on to reset. If normal conditions are restored, the boiler should restart automatically without requiring a manual reset. If the error persists, contact a qualified technician for control panel diagnosis.

What does the 202 error mean on an Immergas heat pump?

The 202 error on an Immergas heat pump indicates a sustained communication error between the control kit and outdoor unit lasting more than three minutes. Switch off the heat pump at the isolator switch for five minutes. Switch back on and monitor for the error. If communication is not restored, contact a qualified technician. Do not repeatedly reset the unit as this will not resolve a wiring or component fault.

What does the 441 error mean on an Immergas heat pump?

The 441 error on an Immergas heat pump indicates cooling operation has stopped because the outdoor temperature has fallen below 9 degrees Celsius. This is normal protective behaviour, not a fault. The heat pump will automatically resume cooling operation when outdoor temperatures rise to within normal operating range. No action is required. The unit should resume normal operation as conditions change.

How do I reset my Immergas boiler?

Locate the reset button on your boiler's control panel, typically marked with a flame symbol or the word Reset. Press the button firmly. On most Immergas models, holding the button for approximately 5 seconds will initiate a restart. If the error clears, the boiler should resume normal operation. If the boiler does not reset or the same error returns, do not repeatedly press the reset button. Contact a qualified technician for diagnosis.

What should I do if my Immergas heat pump outdoor unit is making unusual noises?

Some noise during operation is normal, particularly during defrost cycles when the reversing valve operates. However, unusual grinding, rattling, or continuous loud noises may indicate a fault requiring professional attention.

How can I maximise the efficiency of my Immergas condensing boiler?

To achieve maximum efficiency, lower the flow temperature setting. Condensing boilers operate most efficiently when return water temperatures stay below 55°C, which is the dew point for flue gases. Setting flow temperatures to 60°C or lower typically ensures the boiler operates in full condensing mode, capturing more heat from the flue gases and using less gas. Higher flow temperatures reduce efficiency as the boiler cannot fully condense the water vapour in the exhaust.

How do I repressurise my Immergas boiler?

Locate the filling loop beneath or near your boiler. Open both valves slowly to allow cold mains water into the system while watching the pressure gauge. When it reaches between 1.0 and 1.2 bar, close both valves securely.

Does my Immergas boiler have frost protection?

Yes, Immergas boilers include an antifreeze function. If the system water temperature inside the boiler falls below approximately 4°C, the boiler automatically starts both the pump and burner to heat the water to a safe temperature. This protection only functions when the boiler is connected to the electrical supply and operating normally, not in a fault or block state. During extended absences in cold weather, consider draining the system or adding appropriate antifreeze products to the heating water.