Skip to main content

Ready to hire?

Post your job in minutes, browse real reviews and choose who to speak to.Post a job

Need some tips or advice?

Ask a question
Central Heating

Central Heating & Hot Water system. Gas firing, loft tank, cylinder in airing cupboard & radiators

Anonymous user 23/02/2024 - 3.13 PM

The clock and on/off time controls for the hot water (HW) and central heating (CH) are located next to the wall mounted Baxi boiler. They're all about 10 years old. The settings options available for each (HW and CH) are either 'Off', 'Continuous', 'Once' or 'Twice' per day, with the clock and time settings able to be adjusted as required for the Once and Twice a day on/off times. The problem occurs when HW is set to ON but there is no demand. Under this situation the CH will not operate even when it is set to ON and there is demand for the CH from the wall thermostat. The CH will only operate when HW is either set to OFF, or it is set to ON and there is demand for both HW and CH. So to repeat, the problem is that it not provide CH when the HW is ON but there is no demand for HW. I've concluded the problem must be with one or more of the 3 way valve, its Honeywell actuator/controller, the controls themselves or there's a wiring fault. Any idea?

Are you a tradesperson and able to answer this question?

Log in

1 Answer

Technical Services Group Limited

Rating: 4.9 out of 5
Manchester
Hi, With any problem we encounter, the first question that should be asked is 'has it ever worked'. If it has, and it hasn't been altered, then it's wired correctly. When you say 'one or more of the 3 way valve', is there just one valve? I assume there is, and it's most likely that the problem lies within the valve. You may think the problem is with the room thermostat, but if the system works with the HW off, then the room stat is switching correctly. You could probably replace the head of the 3 port valve which would save the need to drain the heating system. It's certainly worth posting a job on here and getting someone out to give it a check for you.
Answered31 October 2017
0