Any Central Heating Engineers on here?

[admin]

My CH system is on a maintainance contract, but i’m not sure they will come out, as this fault is really intermittant.
If they did, they’d no doubt say “No Fault Found”

Occasionally, the house will start to feel cold.
The stat is calling for heat, but the pump is not running which means the boiler doesn’t start.

I’ve removed the room stat and shorted the contacts.
Nothing happens, no flash from the short.
(If i do this when the system is working, see a small flash from the short, I hear the pump kick in, and boiler start so I’ve ruled out the room stat.)

If i twiddle the stat on the hot water cylinder, the pump kicks in, and the boiler ignites.

So i’ve ruled out the pump, the boiler, and the wiring to the boiler.

If i switch the whole system off at the fused spur, when i switch it back on, everything works as normal.
And will do for a week, before it happens again.
The room stat is battery powered, so is unaffected by this reboot.

The only other thing I can think, is a fault with the timer clock, however, what’s confusing me, is it will do this at any time, the system could have been running, for hours, with the house nice and toasty, and no interruption to the timer cycle.
The room get up to temperature, the stat stops calling, the stat starts calling again, the system doesn’t start.

System has been running fine for 3 years, this only started happening recently.

Any thoughts.

[EFS]

Re: Any Central Heating Engineers on here?

Mine does this occasionally and comes back to life if I give the motorised three way valve a gentle tap.

Steve

[admin]

Re: Any Central Heating Engineers on here?

That’s up in the loft, I’ll try that next.

[Martin]

Re: Any Central Heating Engineers on here?

keat wrote:My CH system is on a maintainance contract, but i’m not sure they will come out, as this fault is really intermittant.
If they did, they’d no doubt say “No Fault Found”

What sort of lousy contract is that then when you dare not even telephone them to explain the problem to ‘heating engineers’. And that you have to resort to asking questions on a website dedicated to washing machines, start shorting out stats AND start banging pipes with hammer in the loft…….?

[admin]

Re: Any Central Heating Engineers on here?

What’s an engineer going to do if he comes out and everything is working.
We all know he’s going to say “Not much I can do” or “see how it goes and call us when it happens again”
So i can sit in all day waiting for them to come, only for him to leave having done nothing, or i can try and figure out whats going on, so I can tell the engineer when he comes what the problem is.

Besides, I couldn’t be A*S*D joining a heating forum.

[Author]

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