Immergas Appliance Repair in Moreland

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 419 error mean on an Immergas heat pump?

The 419 error on an Immergas heat pump indicates an outdoor unit electronic expansion valve operation error. The EEV controlling refrigerant flow is not operating correctly. Switch off the heat pump at the isolator switch. Do not attempt to reset repeatedly. Contact a qualified technician with F-Gas certification for expansion valve diagnosis. This component is critical for proper refrigerant circuit operation.

What does the 554 error mean on an Immergas heat pump?

The 554 error on an Immergas heat pump indicates a coolant leak has been detected in the refrigerant circuit. This is a serious fault requiring immediate professional attention. Switch off the heat pump at the isolator switch immediately. Do not attempt to reset or restart the unit. Contact a qualified technician with F-Gas certification immediately. Refrigerant leaks must be repaired by certified professionals and the system recharged before operation can resume.

What does the 46 error mean on an Immergas boiler?

The 46 error on an Immergas boiler indicates the low temperature safety thermostat has activated. This optional safety feature has detected temperature conditions outside normal parameters. Switch off the boiler at the electrical supply. Allow the boiler to return to normal operating conditions. Press the reset button once. If normal conditions are restored, the boiler should resume operation. If the error persists, contact a qualified technician for thermostat inspection.

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.

How does the defrost function work on my Immergas heat pump?

The heat pump automatically enters defrost mode when ice builds up on the outdoor unit's evaporator coil. During defrosting, the system reverses briefly to melt the ice, then returns to normal operation.

Does my Immergas boiler have a condensate drain that needs attention?

Yes, all Immergas condensing boilers produce condensate that drains away through a dedicated pipe. The condensate drain trap and pipe should be checked as part of annual servicing to ensure they are clear and draining correctly. A blocked condensate drain can cause the boiler to lock out. During very cold weather, external condensate pipes can freeze. If this happens, the boiler will stop working. Contact a qualified technician for assistance as attempting to thaw frozen pipes incorrectly can cause damage.

Why are some radiators not heating up when my Immergas boiler is running?

If some radiators remain cold while the boiler is running, trapped air may be the cause. Bleed each cold radiator using a radiator key by opening the bleed valve until water flows steadily, then close it. Ensure all radiator valves are open. Check that the system pressure is between 1.0 and 1.5 bar after bleeding. If radiators remain cold after bleeding, or if multiple radiators are affected, contact a qualified technician as there may be a circulation pump fault or system blockage.

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.

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.