Immergas Appliance Repair in Heatons North

What does the 404 error mean on an Immergas heat pump?

The 404 error on an Immergas heat pump indicates the overload prevention protection has activated on the outdoor unit. The system has detected conditions that could damage the compressor and has shut down protectively. Allow the unit to rest for 30 minutes. Check that nothing is obstructing the outdoor unit airflow. Switch off at the isolator, wait five minutes, then restart. If the error returns immediately, do not continue resetting. Contact a qualified technician for diagnosis of the overload cause.

What does the 37 error mean on an Immergas boiler?

The 37 error on an Immergas boiler indicates low power supply voltage. The electrical supply to the boiler has dropped below acceptable operating limits. Check that other electrical appliances in your home are working normally. If other appliances are also affected, there may be a general power supply issue in your area. Contact your electricity supplier. If only the boiler is affected, switch off the boiler and contact a qualified electrician to check the electrical supply circuit and connections to the boiler.

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 20 error mean on an Immergas boiler?

The 20 error on an Immergas boiler indicates a parasite flame block. The flame detection system is sensing a flame signal when the boiler should not be firing, which could indicate a leak in the detection circuit or a flame control unit anomaly. If you smell gas, do not operate any switches, ventilate the area if safe to do so, leave the property immediately, and call the gas emergency service from outside. If there is no gas smell, switch off the boiler at the electrical supply and do not attempt to restart. Contact a Gas Safe registered engineer immediately for inspection.

What does the 25 error mean on an Immergas boiler?

The 25 error on an Immergas boiler indicates a block due to flue gas temperature gradient intervention. The boiler has detected a rapid increase in flue gas temperature, which may indicate a blocked pump, insufficient water in the heat exchanger, or other circulation problems. Switch off the boiler at the electrical supply. Allow the boiler to cool down completely for a minimum of 60 minutes. Check that all radiator valves are open and system pressure is correct. Press the reset button once after cooling. If the error recurs frequently, contact a qualified technician.

When does electrical integration (backup heating) activate on my Immergas heat pump?

Electrical integration activates automatically in certain conditions, including during defrost cycles and when outdoor temperatures are very low. The system controller determines when supplementary heating is needed to maintain target temperatures. If the heat pump alone cannot meet the heating demand within a reasonable time, the backup electric resistance provides additional heating capacity.

What operating modes are available on my Immergas heat pump?

Immergas heat pumps support multiple operating modes including central heating, cooling (where applicable), standby, and antifreeze protection. You can cycle through available modes using the Mode button on the control panel.

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.

What annual maintenance does my Immergas boiler require?

Annual maintenance should include cleaning the heat exchanger on the fume side, cleaning the main burner, verifying correct ignition and operation, and checking burner settings for both heating and hot water phases. A visual inspection for leaks and corrosion is also required.

What temperature should I set for domestic hot water on my Immergas boiler?

For domestic hot water, a temperature setting between 50°C and 60°C is typically comfortable for showers and baths while remaining safe. The boiler allows adjustment through the control panel using the dial or button marked with a tap symbol.