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Hi sorry I've hijacked this thread as I've got the same problem. I'm trying to wire a dual channel hive receiver (don't ask) to a heatline vizo 24 (clock has gone so can't program heating to come on and off). I've tried wiring it as single between 1&2 (did something - don't know what) and 1&3...

Yep checked that. Stripped the pump off working ok, really stumped Diverter valve ??

Wow so many replies and advice!!! To update I've stripped the entire pump and checked it... No blockages pump spinning fine... But not circulating the heated water ???? I've stripped the diverter valve and that looks dodgy so I'm going to replace that. Heat exchanger shows no sign off...

Sorry to hijack the post have a similar issue with a potterton pro max he plus was thinking either blockage or h/ex magna clean fitted was working fine last week?

Hi Everyone I've searched for any clues to this one but coming up short. Boiler was working fine was running low (half temp) on ch dial... External controls running ok. Then boiler starts to over heat. Ch kicks in water heats but not going anywhere, pump red hot boiler locks out Display shows...

Hi Everyone I have the above boiler that is leaking from the central heating diff valve where the microswitch is attached. I have searched the threads but most deal with the front diverter leaking. This is leaking from the top nut on where the microswitch touches the top valve. I have attached...

I have a Potterton Puma 80e which is driving me crazy. It has a Myson Compact CP61 pump (not checked). 1st problem was losing pressure slightly - no leaks in house but floor underneath looked like had historical leak issue, but not sure about expansion pipe, kept filling via loop on regular...