Central heating turns off after an hour or so

[Burger]

Did you replace the actuator or the whole valve? You might have a blockage somewhere that’s allowing it to get to temperature and turning off. Have you tried the programmer, as in looked to see if it’s off there? Only reason I had a myson one that if I boosted for an hour would sometimes turn off when hot water was satisfied.

 

[JimSharp39]

Did you replace the actuator or the whole valve? You might have a blockage somewhere that’s allowing it to get to temperature and turning off. Have you tried the programmer, as in looked to see if it’s off there? Only reason I had a myson one that if I boosted for an hour would sometimes turn off when hot water was satisfied.

Just the actuator replaced. When I removed the old one, I checked the valve and it rotated very easily and wasnt leaking. The programmer is fairly new, about three months old. It appears to work as expected but Im not sure how it can be tested other than by replacement. To be fair this is the third fp715 ive had in this house in 12 years. Not the most reliable of kit according to the interwebs either.

 

[Last Plumber]

Ive tested the hpa2 wiring now. According to my instructions this four wire unit is brown live, blue neutral and the grey and orange are switched.
My test is, heating off and cold:
Brown blue 0v
Blue orange 0v
Blue grey 240v
Grey orange 220v

If it is calling for heat and you have those readings then there most likely is an issue with the programmer, room stat or wiring.

 

[JimSharp39]

If it is calling for heat and you have those readings then there most likely is an issue with the programmer, room stat or wiring.

Thanks, its pointing to the roomstat as many have suggested! Programmer is newish and the house is less than 15 years old which kinda suggests its not very likely. Appreciate all your thoughts so far mate

 

[Murdoch]

Thanks, its pointing to the roomstat as many have suggested! Programmer is newish and the house is less than 15 years old which kinda suggests its not very likely. Appreciate all your thoughts so far mate

A lot of “new” products are very substandard .......

 

[JimSharp39]

A lot of “new” products are very substandard ...

Agree, this is my third same programmer. To be fair the court of the internet doesn’t rate it, but it fits in the space I have.

 

[Last Plumber]

Thanks, its pointing to the roomstat

I think I said earlier, either test the stat with your meter or link it out. If you link it out an all works well for a day or two you will have your answer.

 

[JimSharp39]

I think I said earlier, either test the stat with your meter or link it out. If you link it out an all works well for a day or two you will have your answer.

Yes, next job! I thought it unlikely at the start but having eliminated almost everything else looks like the guilty party!