PROTHERM BOILER


Postby johnsants » Mon May 14, 2007 8:56 pm

Hi, This protherm boiler type 80 EC was working OK. I shut it down for about 1 month to carry out some work on the house.

now it only runs with the covers removed. If I remove the front cover, under that is a metal plate that fits over the burner unit.The boiler works with this cover removed but as soon as you fit this panel the gas supply shuts off. There is a pressure switch at the top of the chamber which has a tube going to the flue. This pressue switch appears to be the problem
Overriding this switch brings the boiler back on. Any suggestions on what might be causing this problem?. Many thanks John.
johnsants
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Joined: Mon May 14, 2007 8:44 pm

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Postby Paul Pepper » Tue May 15, 2007 6:19 pm

Check the flue isn't blocked by something daft like a bird's nest before you go changing the switch - it's an air pressure switch that uses a diaphragm to sense that the fan is running. It's also worth checking that the sense tubes are not split or blocked, and that the venturis (the bits where the sense tubes enters the fan) aren't blocked or damaged.

Paul
Paul Pepper
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Joined: Fri May 11, 2007 6:02 pm


Postby johnsants » Wed May 16, 2007 7:29 pm

Hi, Thanks for your reply, The flu looks ok and the tube is not damaged.Where would you recommend I get a replacement switch from..
Regards.
johnsants
Posts: 2
Joined: Mon May 14, 2007 8:44 pm


Postby Paul Pepper » Fri May 18, 2007 5:32 pm

Most plumbers's merchants would be able to help - depends who you've got in your local area to be honest!

Paul
Paul Pepper
Posts: 38
Joined: Fri May 11, 2007 6:02 pm


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