Puma 80 CH problems Hot water but No central Heating

[ianm00]

Listen to the experts on here!

AAV needs replacing. Wax capsule needs repairing / replacing by your 'bod'

The AAV is on the heating side of your combi.

If you dont underatand then lie back and trust us!

David

Im just trying to understand how it works. Im an electronic engineer so Im fine with the electrics but not so good at plumbing.

Thanks for you help

Ian

 

[ianm00]

All,

I have replaced both the automatic Air vent & the complete diverter valve assembly.

Hot water seems to work OK but still no CH.

When CH switched on boiler fires up, the CH return pipe gets warm but the flow pipe stays cold. Using a screwdriver against the pump it sounds like its running and it gets very hot. After a few mins the boiler shuts down even the pilot light goes out.

Can anyone please suggest a fault.

Thanks

Ian

 

[ChrisR]

CH return pipe gets warm but the flow pipe stays cold

Not unheard-of though rather odd fault, unless the pump's in backwards - is that possible?

Check the flow valve is open (red handle, should be in line with its pipe).

 

[ianm00]

CH return pipe gets warm but the flow pipe stays cold

Not unheard-of though rather odd fault, unless the pump's in backwards - is that possible?

Check the flow valve is open (red handle, should be in line with its pipe).

The pump hasn't been taken out so it should be OK. Both taps are on, its the one with blue tap thats getting warm which is definitely return pipe.

The pump also gets v hot. Although the I can hear whining with screwdriver on pump how can I comfirm that it is spinning?

Any suggestions as to what else could be wrong?

Thanks again

Ian

 

[gazthepottertonengineer]

Welcome KevinfromBaxiPotterton.
Question ? How many heateam engineers does it take to rule this site. LOL

How many are on here now i can think of 5

any advances on that

 

[Vic Spanner]

Gaz, Only another 175 to go and that will be the whole team.

 

[ianm00]

Is it possible that the pump is full of air and somehow needs bleeding?

Any other suggestions about this problem?

Please help Im freezing!

Thanks

Ian

 

[andsam]

Flow switch could be sticking.

 

[andsam]

Its on the left hand side. There are 2 wires going to a brass housing, pull off one of the wires this will disconnect the flow switch and then if the heating fires and works the flow switch is sticking.

 

[ianm00]

Flow switch could be sticking.

Is there a simple way to test this?

Thanks

Ian

 

[andsam]

Did you get my second post.

 

[ianm00]

Did you get my second post.

Yes just seen it I will try now

Thanks

Ian

 

[ianm00]

Its on the left hand side. There are 2 wires going to a brass housing, pull off one of the wires this will disconnect the flow switch and then if the heating fires and works the flow switch is sticking.

I tried this heating fires and starts to work then boiler shuts down as before. The CH return pipe gets warm the Flow stays cold. Also steam appears at the auto air vent and this one is hot!

Any ideas?

Thanks

Ian

 

[andsam]

It may be the pump is either stuck or spinning slowly. Have the isolation valves under the boiler been turned off at any time ? I have known some to snap in the off position. Remove the plastic covers and check to see if the are open.

 

[ianm00]

It may be the pump is either stuck or spinning slowly. Have the isolation valves under the boiler been turned off at any time ? I have known some to snap in the off position. Remove the plastic covers and check to see if the are open.

The isolation valves have only been turned off today as we changed the diverter valve. Using a screwdriver against the pump and my ear I can hear the pump. But you may be correct it may be spinning two slow is this possible?

The hot water side seems to work ok.

Cheers

Ian