central heating pump will not run

[AlexFrancis]

Hi guys, could really do with some advice on this please.

We have a Potterton suprima 30 boiler that fires up and runs fine but the pump is not running, causing the boiler to shut off or over heat. I thought the pump must have gone. But i have replaced this and it still will not run? The motorised valve seems to be operating ok.

Would be gratful for anyones thoughts or ideas to try before i call in a plumber.

Thanks.

 

[HERTS P&D]

Is there power to the pump when heating is called for and thermostat is turned up?

Andy

 

[AlexFrancis]

Is there power to the pump when heating is called for and thermostat is turned up?

Andy

I dont have means to test for power to the pump. But the cable to the boiler and motorised valve and the pump comes from the same junction box. So i assume the power supply to the pump is ok.

Thanks for the reply

 

[HERTS P&D]

If you can't test for power then all a plumber!

Andy

 

[AlexFrancis]

Ok, have tested for power at the pump with multimeter and there is nothing.

Does this mean the pump cable is damaged? This is just a short cable thats runs straight to a connection box that has power?

 

[HERTS P&D]

Have you tested the control box where the wire to the pump comes from?

My advice still stands, call a plumber.

Andy

 

[Madrab]

Does this mean the pump cable is damaged? This is just a short cable thats runs straight to a connection box that has power?

If you are saying there is no power at the pump end of the cable but power at the other end of the cable in the control box? theeeeeennnnnnnnnn...........the cable must be the problem, yup.
I'd call a heating engineer as Herts suggests

 

[adelaine041]

You might want help from professional plumbers since you have tried doing it yourself.