No Central Heating & Pump Overun Question

[carlsbergy]

I have a house which I rent out, Potterton Kingfisher boiler, fully pumped system,Grasslin contractor pack QE2, all installed about 6 yrs ago.

Currently there is no central heating, the tenant said there has always been a light on the room thermostat which is no longer working and the hot water side only seems to be working. The three port valve seems to be stuck in position A, and does not move if the cental heating is turned on at the control unit. Faulty thermostat? or three port valve? or neither

It has been working up to now fine, I have checked all the wiring and it seems to be ok according to the contractor pack wiring instructions.

Second question, years ago I went to put this boiler under a British Gas contract but they turned it down dues to 'pump overun'.I have had a read of the Potterton instructions and there is a section on overheat thermostat and pump overun device for fully pumped open vented systems. Does is sound like it is not wired correctly to the boiler?

Thanks in advance

 

[ChrisR]

probably the MV head faulty - but it needs diagnosis!

Overrun - if the manual says it needs the pump to be wired to the boiler; is it??

 

[carlsbergy]

Thanks Chris, replaced motor in head and heating now working. Pump not wired into boiler so will do that. Thanks again