Immergas Appliance Repair in Kingsholm and Wotton

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 05 error mean on an Immergas boiler?

The 05 error on an Immergas boiler indicates a flow temperature probe anomaly. The NTC temperature sensor measuring water flow 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 after reset, contact a qualified technician for diagnosis and probe replacement. The boiler will not operate correctly with a faulty flow probe.

What does the 06 error mean on an Immergas boiler?

The 06 error on an Immergas boiler indicates a domestic hot water probe anomaly. The NTC temperature sensor measuring hot water temperature is reporting incorrect readings or has failed. The boiler may continue to provide heating but hot water production will be affected. 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.

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 03 error mean on an Immergas boiler?

The 03 error on an Immergas boiler indicates the flue safety thermostat has activated due to excessive flue gas temperature. This is a critical safety feature detecting potential flue obstruction or combustion problems. Do not attempt to reset or override this safety feature. Do not use the boiler. Ensure the room is well ventilated. Contact a Gas Safe registered engineer immediately as flue problems can lead to carbon monoxide exposure, which is potentially fatal. Do not delay professional inspection.

What pressure should my Immergas boiler system maintain?

The boiler pressure gauge should read a value between 1.0 and 1.2 bar when the system is cold. This is the optimal operating range for most Immergas boilers.

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.

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.

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.

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.