Patterson puma 80e

[DADDYorCHIPS]

Hi,

just wondering if anyone can point me in the right direction! I have a potterson puma 80e! It was already installed when I purchased the house and to be honest it looks rather old and neglected!

but this said it still works. Had a few new parts recently. A new fan. And a new diaphragm flow switch because it started leaking

my current problems probably all related! Since the fitting the flow switch. When the boiler first starts it will turn on run for 30seconds then stop and repeat it’s self until it starts to work normally. No consistent routine I’m aware of. Also the boiler tends to lock out after calling for hot water! Not all the time but more often than not it does! My boiler is now just sowing the running for 30seconds routine constantly now. But hot water is working as normal. It’s a bit frustrating so I’m hoping someone could point me in the right direction

I’m aware I probably need a new boiler! I’m just not sure I want to go down the combi boiler route as I have plans to extend the home. So thinking of maybe going down the eco route. So a short term fix would be a good fix right now!

regards

 

[DP]

Get a heating engineer in who knows this boiler. Not many who will know how it works, but boiler I imagine can easily be sorted. Your boiler will start in HW mode every time, then changes to CH if hot water tap not running

if you have a hot tap dripping, boiler may not switch to heating

 

[DADDYorCHIPS]

Thanks, I will get an engineer out! Just not the best time New Year’s Day!

If I had a dripping tap the boiler would think it’s calling for hot water. But it isn’t. I thought all combi boilers would work on the same principle!

thought it might be a easy fix has you can get hot water with no issues

 

[ianmcd]

Thanks, I will get an engineer out! Just not the best time New Year’s Day!

If I had a dripping tap the boiler would think it’s calling for hot water. But it isn’t. I thought all combi boilers would work on the same principle!

thought it might be a easy fix has you can get hot water with no issues

No they dont, close the cold water inlet valve and obviously you wont get HW at the taps but if your false firing stops then you need a new wax capsule in the diverter valve

 

[DADDYorCHIPS]

I just turned the stop tap off! Will this do the same thing? Boiler fired up momentarily then switched off. Then repeated a few minutes later then the false firing starts again.

 

[ianmcd]

pull one of the wires off the DHW flow switch and leave it off, and see what happens

 

[DADDYorCHIPS]

I’m not really sure what the dhw switch is? Is this above the diverter valve? The bit I’ve circled

 

[DADDYorCHIPS]

I decided to pull one off the diaphragm bottom right of the photo. it has made no difference

 

[ianmcd]

no that one

 

[DADDYorCHIPS]

 

[DADDYorCHIPS]

Just seen your photo! That’s the one I removed made no difference

 

[DADDYorCHIPS]

Any more ideas on my problem Ian? Doesn’t sound like a wax capsule! I take it if the pump wasn’t working I wouldn’t be getting hw either?

 

[ianmcd]

Any more ideas on my problem Ian? Doesn’t sound like a wax capsule! I take it if the pump wasn’t working I wouldn’t be getting hw either?

No your boiler has what is called a BI-thermal heat exchanger, or twin pass some call it, when you run a HW tap the pump stops running and the water passes through a separate coil in the main heat exchanger, when the tap stops then the pump comes on to send the heat to the radiators, hence why if you have a dripping HW tap the heating wont work, with a demand for Heating but not HW does the pump run as it should ?

 

[DADDYorCHIPS]

Hard to tell if the pump is working! When the boiler stops I listen for sounds that it’s still running but it’s hard to here what with all the other noises! Is there a way to test? There is a nut in the centre of the pump. Should this be free?

 

[ianmcd]

Hard to tell if the pump is working! When the boiler stops I listen for sounds that it’s still running but it’s hard to here what with all the other noises! Is there a way to test? There is a nut in the centre of the pump. Should this be free?

No it uses the Myson pump that nut should not be free, get a large screwdriver and place it on the metal body of the pump and put the other end to your ear and you will hear if the pump is running or not