Multi Fuel Stove and Central Heating

Alex1983

The TRV's can't turn the heating on or off, they can only control the temperature to the radiatior when the heating is on

PMurphy

That is a very good question.

I'm assuming it goes to the timer, it meets another cable in a small junction box then disappears behind the side of the cupboard, into what I assume is the back of the timer.

The only thing i can think of is, when I disconnected the unit the other day, then clipped it back in, i knocked something out of place, causing it to disconnect with the pump.

It's one of these, fitted to a mount inside that cupboard

PMurphy

Alex1983 wrote: »

The TRV's can't turn the heating on or off, they can only control the temperature to the radiator when the heating is on

I appreciate that, but we have the heating timer set to on, as in on all the time, and the TRVs open on full and there is still no heat it's quite frustrating.

Le_Kirk

That looks like a Salus RT300 or similar and is definitely thermostat and shouldn't be in a cupboard. You say the pump does not run but have you (or competent person) actually checked for voltage at the terminals of the pump? If voltage is present it means there is a call for heat but pump has failed.

Alex1983

As I said I'm a heating engineer working on gas so not sure with wood burners but unless there is as someone said early some sensor/ control that I'm not aware of that controls the pump, then I would say either the timer isn't sending power to the pump or the pump has power but not running and has failed.

PMurphy

Those are my thoughts. I think, then I moved the unit recently I've dislodged something.

Alex1983

Did it work before you moved whatever you moved

PMurphy

Alex1983 wrote: »

Did it work before you moved whatever you moved

Yes, as I say the cupboard use to be very, very warm, but now it isn't.

I've just spoken to a plumber who said, ring an electrician, the electrician can pop around to have a look this afternoon or tomorrow, waiting for a call back.

Alex1983

I would think it's something you did im afraid. I would suspect the ch on cable on the timer has come out. Let me know what the sparky says, I'll be interested to know the outcome.

Wookey

The pump could be stuck if the house sat empty for a while, several things to check.

There will be a bleed screw on the front of the pump usually, this will need removing and a small slotted screwdriver inserted inside and turned to free up the pump impeller, do this with the heating of and the pump of.

If the pump is turning freely you will need to check if its receiving electric, a simple phase tester or a proper meter should suffice for this, you may need to play around with the controller or hot water thermostat settings to get electric to the pump. If you are still not having any joy you could disconnect the pump cable from the controller/junction box and stick a plug on it and run it from an extension lead to prove it is working.