Baxi (rm512?) hw works, no ch

[harrierfx]

Sorry a bit of a novice.....not sure of the Baxi model no.? hw works ok but no ch, i have checked pump (Grundfos 15/60) and there seems to be splash marks and white deposit around seals, i presume this is the problem, if so do i have to repressurise the boiler after changing the pump and is changing the pump as easy as it looks????

 

[chrishutt]

i presume this is the problem

You presume too much. If you want to check the pump, use a screwdriver (blade to pump - handle to ear) to listen. You should hear the noise of the pump rotating. If you hear just a hum, or nothing, the pump may need freeing.

 

[harrierfx]

hi chris thanks for your prompt reply. ok tried that....no noise at all and boiler not firing up, if i undo screw to turn manually on pump water comes out, and the white deposits?

thanks in advance

 

[chrishutt]

Is the electrical supply to the pump live?

 

[harrierfx]

Hi chris, the power seems to be going to the pump but is not turning, i have tried manually turning the pump and appears to run freely. As an update there is a Honeywell F5 9922 silver box on top of the pipe to the pump, this has two settings, when i turned to "main" from "auto" the heating comes on.

 

[harrierfx]

can anyone help please?

 

[Mikeyboy]

Sounds as though the problem is with motor fitted within the zone valve.This motor,when it receives a switched live supply ,from room or cylinder stat ,moves into heating/hot water mode,and then auxillary switch operates,sending live supply to boiler and pump.A new sychron motor is about 18 quid and a simple 15 minute repair.Do not forget to isolate power before repair.

 

[harrierfx]

thanks mikey will try at the weekend

 

[kevplumb]

£18 try £8