The heating has stopped working!

[camerart]

Christmas eve, eve and the central heating has stopped working

Just checked a few things:
The boiler works, and heats the water at the correct time ok.
The mains switch switches the display and thermostat on/off ok.
The thermostat switches the yellow wire (Red/Blue/Yellow) on/off ok.
The timing display switches the thermotat on/off ok.

I don't hear noise from the pump, so I suspect it is this.

Any advice for pump checking is welcomed.

Camerart.

 

[simond]

Have a look at your post again and ask yourself what key information is missing.

EG: My car won't start, what is wrong with it?

 

[simond]

It's a blue one if this helps

 

[Nige F]

Screwdriver to your ear and against the pump - someone to switch on/off you should hear it turning.

 

[camerart]

Screwdriver to your ear and against the pump - someone to switch on/off you should hear it turning.

Hi N,
Just checked the yellow/brown wire to the pump and there is current, and switches on/off with thermostat.
Checked across the pump, and there is resistance, but I can't get an accurate reading. perhaps 200 kOhm or with another meter even mOhm.
Just moving a compressor, then floorboards. (don't move)
C.

 

[camerart]

Hi,
Nothing from the pump, but it's very warm. (Could be hot water making it warm??)
C.

 

[jackthom]

Is the boiler making any attempt to fire up, even briefly, when you turn up the heating room thermostat.

 

[JohnD]

Is the pump hotter than the pipes around it?

 

[andytw]

Sounds like it's the pump then !
Remove centre screw from pump, can you turn the pump internals ?
Take pump apart, same question.
Buy and fit new pump.

 

[camerart]

Hi all,
Boiler switches on and hot water ok.
Pump turning.
Pump hotter that pipework
Power to the pump.

C.

 

[oldbuffer]

Could be the pump's motor capacitor, particularly if pump hums and is hotter than water.

See if pump is actually turning when it should be. Take out centre screw, insert screwdriver and see if rotor is turning. If not, most likely capacitor.

Hard to get hold of correct physical size, capacitor value usually 4 to 8 microfarads, but must be AC rated for peak (not average) voltage - say 400V or more.

 

[camerart]

Could be the pump's motor capacitor, particularly if pump hums and is hotter than water.

See if pump is actually turning when it should be. Take out centre screw, insert screwdriver and see if rotor is turning. If not, most likely capacitor.

Hard to get hold of correct physical size, capacitor value usually 4 to 8 microfarads, but must be AC rated for peak (not average) voltage - say 400V or more.

Hi OB,
The capacitor is 2.0uF 400V, but it reads 0.08uF so you could be right.
There is a very slight hum at the pump.
Motor turning ok.
C.

 

[JohnD]

Pump turning.
Pump hotter that pipework

If the pump is hotter than the pipes, it is not pumping. Either jammed, failed, clogged or dry.

You say it is turning? (how do you know? Did it spin the screwdriver you poked in?)

Is there any water in it?

 

[camerart]

If the pump is hotter than the pipes, it is not pumping. Either jammed, failed, clogged or dry.

You say it is turning? (how do you know? Did it spin the screwdriver you poked in?)

Is there any water in it?

Hi J,

Screwdriver in the hole turns it easily.
Few drips of water.
Not spinning when switched on.

C.

 

[camerart]

Hi all,

Thanks to everybody who helped me. I'll have to wait till after Christmas now, so that's all from me.
I'll start by buying a Capacitor, then go from there.
HAPPY CHRISTMAS.
C.