Potterton Profile 80 not firing up

[catnipsta]

I have just recently moved into my new home, which has a Potterton Profile 80 boiler heating a vented CH & HW system. There are 2 HW cylinders located in the loft, below the cold water cistern.

Both CH & HW were working fine until I replaced 2 of the radiators, ever since ,the boiler fails to ignite (the pilot light remains off).

Before I made the replacements, I first turned both the HW & CH on the controller to OFF, closed the CH cistern tank supply valve, drained the system, replaced the rads, refilled the system (took a while due to the valve not opening up properly), bled the rads and finally turned the HW & CH ON at the controller.

First there was no response at all. then I found out that I may need to press the "red cross button" - some overheat system, after which the fan operated when the thermostat is turned up, but still no pilot light or ignition.

HELP

 

[gasmick2]

hi it could be the air pressure switch not pulling in with the fan that will stop it ignighting, its not a job for diy though , you could have a look to see if any of the plastic pipes are broken or split i always carry a peice of tubing so i can suck on the a p s pipe very gently to see if its operating also there should be 240v on the switch check to see if its switching over when the fan comes on

 

[catnipsta]

Just to update.

The boiler seems to be working fine now.

I am guessing that the part that tripped the overheat function must have cooled down sufficiently enough over-night.

However, I perhaps need to drain the system again, as I have read in the manual (at http://www.partsarena.com) that my bathroom radiator (a by-pass radiator) can only be fitted with lockshield valves.

Good thing it is summer & a weekend, else I would have called out a Corgi engineer for nothing.