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Plumberpro
Plumberpro, Home Appliance Technician
Category: Appliance
Satisfied Customers: 634
Experience:  Heating and hot water heating appliances experienced
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Hi tryin to fix a potterton performa he 30 boiler starts up

Resolved Question:

Hi tryin to fix a potterton performa he 30 boiler starts up on cold hits 40 temp neon then fan flue fault flashes.
Fan spins
New air pressure switch installed
Venturi + flue all clear
Boiler works fine if air pressure switch is blown into
Submitted: 2 years ago.
Category: Appliance
Expert:  Plumberpro replied 2 years ago.
Plumberpro :

Him. Do you have a multimeter to test the ohms reading on the fan? Yousay the fan spins , does it spin freely and smoothly?

Customer: Not at the job now yes fan runs free
Customer: Not at the job now fan runs until call for heat has stopped
Plumberpro :

Hi . does it do this on hot water and heating ?

Expert:  Plumberpro replied 2 years ago.
Hi . sorry , it switched from chat to question and answer , but we can continue like this
Customer: replied 2 years ago.
All normal but no click from air pressure switch until I blow down positive tube boiler fires up fine
Expert:  Plumberpro replied 2 years ago.
Pretty sure its going to be the fan .they can be tested on ohms .most will be 40 to 80 ohms . less than 20 and more than 150 replace . sometimes as they heat up they go faulty.
Customer: replied 2 years ago.
Any idea what pressure should be coming from the Venturi to activate the air pressure switch
Expert:  Plumberpro replied 2 years ago.
I've never seen that given anywhere , but if you can trick the boiler into firing by blowing down the tube then the rest of the boier is probably ok . and it will most likely be the fan . when they start to get week you get intermittent failure where it attempts to relight . eventually it goes completely
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