Viessmann Appliance Repair in Matson, Robinswood and White City

What does error code 40 mean on a Viessmann boiler?

Error 40 on a Viessmann boiler indicates a short circuit in the flow temperature sensor for heating circuit 2 (with mixer). The mixer will close down. Contact a heating engineer to inspect and replace the flow sensor.

What does error code EA mean on a Viessmann boiler?

Error EA on a Viessmann boiler indicates the ionisation current is outside the permissible range during calibration. Contact a Gas Safe registered engineer to check the ionisation electrode and gas supply system.

What does error code F8 mean on a Viessmann boiler?

Error F8 on a Viessmann boiler indicates the flue gas temperature is too high, suggesting restricted airflow or a blockage. Contact a Gas Safe registered engineer to check for flue blockages and inspect the heat exchanger.

What does error code F1 mean on a Viessmann boiler?

Error F1 on a Viessmann boiler indicates the maximum flue gas temperature has been exceeded. Allow the boiler to cool down, check the heating system water level, bleed air from the system, and verify the circulation pump is working. Press reset after cooling. If the fault recurs, contact a qualified heating engineer.

What does error code 38 mean on a Viessmann boiler?

Error 38 on a Viessmann boiler indicates the boiler water temperature sensor cable is broken. Contact a Gas Safe registered engineer to repair or replace the sensor and cable.

What is the ideal room temperature for heating?

The optimum temperature for living rooms is between 20 and 21 degrees Celsius. Kitchens can be kept slightly cooler at 18 to 19 degrees as they benefit from heat generated by appliances. Bedrooms are comfortable at 18 to 19 degrees, which also promotes better sleep. It is recommended never to let your home fall below 14 degrees Celsius to prevent damp and mould issues.

What is a condensing boiler?

A condensing boiler captures heat from exhaust gases that would otherwise be lost, converting water vapour back into liquid around the heat exchanger. This process makes condensing boilers significantly more efficient than older non-condensing models, typically operating at around 90 per cent efficiency. Upgrading to a modern condensing boiler can reduce heating bills by up to 30 per cent.

Do heat pumps work in cold weather?

Yes, modern air source heat pumps can extract heat from the air even at temperatures as low as minus 20 degrees Celsius. Even near freezing temperatures, heat pumps can still achieve a Coefficient of Performance of around 3, meaning they produce three kilowatts of heat for every kilowatt of electricity used.

Are heat pumps noisy?

Modern heat pumps are designed to operate quietly. At a distance of four metres, a typical air source heat pump produces around 35 decibels, which is comparable to quiet whispering or a library environment. Proper installation and positioning help minimise any noise impact on your home or neighbours.

How can I reduce my heating costs?

Key steps include reducing your thermostat temperature by just one degree, which can save up to 6 per cent on heating costs. Ensure radiators are not blocked by furniture or curtains, bleed radiators regularly to remove trapped air, and schedule annual boiler servicing to maintain efficiency. Keeping rooms at appropriate temperatures (20 to 21 degrees Celsius for living areas) balances comfort and economy.