This Could be an interesting one guys :/

[Pooly89]

hi guys

I have a very weird fault on a system at clients property. I have suggested that wiring more than likely needs looking at.

So standard open vent system with ideal classic heat only installed hot water seems to be working fine.

however when the central heating is turned on at the programmer and the room stat is set at 10 degrees(the house is definitely above 10 degrees) the boiler is still firing and what it seems to be doing is shutting off when the boiler stat is satisfied and firing up again moments later to maintain this.

I have had the room stat off the wall and we have on switch live to earth- 240v, live to earth 240v and neutral to earth- 0v. obviously when the switch is not in place we are not supposed to be getting 240v from the switch live.

so I guess my question is other than the wiring being defective is there any other reason why I would be getting 240v on the switch live from the stat?

any help you can give would be greatfully received guys


Cheers

Pooly

 

[ShaunCorbs]

prog disconnect the prog and re test at stat as prog should be nothing there eg 0 is the first port of call eg

prog

room stat

2/3 port valve

pump and boiler

 

[GasmanxxxR1]

Normally when heating is staying when not wanted its the actuator, however as previously stated the switch live starts at the programmer then moves to stat, then actuator then boiler/pump. so start at the programmer and work that way chasing the dodgy live feed

 

[Leo21]

S plan or y plan? If you've got voltage to the room stat on an s plan, it's wiring. If you haven't it's the zone valve stuck open.