Immergas Appliance Repair in Matson, Robinswood and White City

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 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.

What does the 04 error mean on an Immergas boiler?

The 04 error on an Immergas boiler indicates a contacts resistance block, meaning there is a fault detected in the gas valve electrical supply circuit. 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. Do not attempt to reset. Contact a Gas Safe registered engineer for professional diagnosis and repair of the gas valve circuit.

What does the 458 error mean on an Immergas heat pump?

The 458 error on an Immergas heat pump indicates a fan motor malfunction on the outdoor unit. The fan required for heat exchange is not operating correctly. Switch off the heat pump at the isolator switch. Visually check from a safe distance that nothing is obstructing the fan blades. Do not attempt to access or touch the fan. Switch back on and listen for fan operation. If the fan does not start or makes unusual noises, contact a qualified technician for motor diagnosis and repair.

What does the 320 error mean on an Immergas heat pump?

The 320 error on an Immergas heat pump indicates an OLP sensor error. The overload protection sensor on the compressor has detected a fault. Switch off the heat pump at the isolator switch. Do not attempt to reset repeatedly. Contact a qualified technician with F-Gas certification for compressor and sensor inspection. This protection system prevents compressor damage from electrical overload.

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 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.

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 is weather compensation on my Immergas heat pump?

Weather compensation automatically adjusts the flow temperature based on outdoor conditions. When it is colder outside, the system increases the water temperature to provide more heat. When it is warmer, the temperature is reduced to save energy. The system uses an outdoor temperature sensor to monitor conditions. This feature improves efficiency by preventing the heat pump from working harder than necessary. The heating curve settings are typically configured by your installer to suit your home.

At what temperature should I store hot water to prevent bacteria growth?

If your Immergas system includes a hot water storage cylinder, the water should be stored at a minimum of 60 degrees Celsius to prevent the growth of harmful bacteria including Legionella. Water at taps should reach at least 50 degrees Celsius within one minute of running. Some Immergas systems include an anti-legionella function that periodically raises the stored water temperature automatically. This does not apply to combi boilers which heat water on demand without storage.