Immergas Repair Service in Fletton and Woodston

What does the 10 error mean on an Immergas boiler?

The 10 error on an Immergas boiler indicates insufficient system pressure. The water pressure in the central heating system has dropped below the minimum level required for safe operation, typically below 0.8 bar. Check the pressure gauge on the boiler, which should read between 1.0 and 1.5 bar when cold. If pressure is low, locate the filling loop and slowly add water until the gauge reads within the correct range. Close the filling loop valves securely when finished. If you need to repressurise frequently, this indicates a leak in the system requiring professional attention from a qualified technician.

What does the 463 error mean on an Immergas heat pump?

The 463 error on an Immergas heat pump indicates OLP overheating. The overload protection system has detected excessive temperature. Allow the unit to cool down completely for at least 30 minutes. Check that the outdoor unit has adequate ventilation and airflow is not restricted. Switch off at the isolator, wait five minutes, then restart. If the error persists, contact a qualified technician for diagnosis of the overheating cause.

What does the 16 error mean on an Immergas boiler?

The 16 error on an Immergas boiler indicates a fan anomaly. The combustion fan is not operating correctly due to a mechanical or electrical fault. Switch off the boiler at the electrical supply. Wait 30 seconds and switch back on to reset. Listen for the fan starting when the boiler attempts to fire. If you hear no fan noise or unusual sounds, contact a qualified technician. The fan is essential for safe combustion and flue gas removal, so do not attempt to operate the boiler if the fan is not working correctly.

What does the 31 error mean on an Immergas boiler?

The 31 error on an Immergas boiler indicates loss of communication with the remote control or room thermostat. If using a wireless thermostat, check and replace the batteries. Ensure the thermostat is switched on and set to call for heat. Verify the thermostat is within range of the boiler receiver unit. If using a wired thermostat, check that it is switched on and calling for heat. Switch off the boiler at the electrical supply, wait 30 seconds, and switch back on. If communication is not restored, contact a qualified technician to check wiring and control compatibility.

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.

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.

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 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.

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.

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.