Immergas Appliance Repair in Petersfield

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 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 251 error mean on an Immergas heat pump?

The 251 error on an Immergas heat pump indicates a discharge temperature sensor malfunction. The sensor measuring compressor discharge temperature is faulty or disconnected. Switch off the heat pump at the isolator switch for five minutes. Switch back on and monitor operation. If the error persists, contact a qualified technician for sensor testing and replacement.

What does the 23 error mean on an Immergas boiler?

The 23 error on an Immergas boiler indicates a return temperature probe anomaly. The NTC temperature sensor measuring return water temperature is reporting incorrect readings or has failed. Switch off the boiler at the electrical supply. Wait 30 seconds and switch back on to reset. If the error persists, contact a qualified technician for probe testing and replacement. This sensor is important for efficient boiler operation and protection against overheating.

What does the 231 error mean on an Immergas heat pump?

The 231 error on an Immergas heat pump indicates a condensation temperature sensor malfunction. The sensor monitoring refrigerant condensation temperature has failed or is reporting incorrect values. Switch off the heat pump at the isolator switch. Contact a qualified technician with F-Gas certification for diagnosis. This sensor is critical for efficient heat pump operation and refrigerant circuit protection.

Why does my Immergas boiler keep losing pressure?

Frequent pressure loss typically indicates a problem that requires professional diagnosis. Common causes include small leaks in the heating system pipework or radiator valves, a faulty pressure relief valve, or a problem with the expansion vessel. If you need to repressurise more than once every few months, contact a qualified technician to identify and repair the underlying cause. Do not ignore persistent pressure loss as it can lead to boiler damage or system failure.

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.

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.

How do I switch my Immergas boiler between summer and winter mode?

Use the mode selector on the control panel or remote control to switch between modes. In summer mode, the boiler provides domestic hot water only and central heating is disabled. In winter mode, both domestic hot water and central heating are enabled. If using a CAR remote control, turn the main selector to the desired position. The display will show the current mode. Some models use icons: a sun or umbrella symbol for summer mode and a snowflake symbol for winter mode.

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.