Pressure switch on Potterton 60e not switching.

[howieleem]

Hi
I have Potterton 60e, on switch on the fan starts ok but the pressure switch is not switching to start gas and light pilot.
Both air pipes are ok, the sealing of the boiler seems ok.
If i force the air pressure switch the boiler starts ok.
Is the problem lack of sealing to the boiler casing, or is the Pressure switch not sensitive enough?
Cheers
Howard

 

[ChrisR]

Could be one of half a dozen things, which need the right kit to test for safety. You need to call in a Corgi

 

[ollski]

always check the flue and venturis on these plus those little airflow restrictors in the clear aps tube.

 

[howieleem]

Where is the Aps tube?

 

[ollski]

we are talking about a prima and not a profile aren't we?

 

[howieleem]

No, its a Profile with twin flu, with plastic tube from inner flu and one from outer flu going to pressure switch to check for differential pressure between the two.

 

[cjb1971]

Might be fan on way out-not giving the aps the desired pressure,or if fans ok may be faulty aps requiring to much pressure to activate it

 

[howieleem]

Yes i think it could be one of those two at fault. Can you explain how the 2 pressure venturii work, one is pointing down into heat exchanger the other is pointing up the flu. How is the differential between the two venturi generated?