ravenheat 820/20 thermocouple

Joined
26 May 2007
Messages
14
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Location
Birmingham
Country
United Kingdom
I believe my thermocouple is knackered!
The pilot will light until the knob is released.
Looking at the boiler and thermocouple picture, there is a connection to the pilot, a connection to the gas valve and another connection.

Where does the third connection go (looks like a silver disc), and what does it do?

Thanx.
 
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That is an overheat thermostat....if the boiler gets too hot then it trips and shuts the pilot out.
 

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