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how to fix my ravenheat boiler?

Does any one know what the component is on the right hand side on my ravenheat csi 85 (t) its a small green plastic piece with a metal pin and clips onto the pipe which goes into the combustion chamber it has 2 yellow wires attached to it which terminate on block terminal m12. Its also just below the overheat thermostat.(cannot find it on the wiring diagram).many thks
alan, February 2011
Its the CH thermistor which also affects DHW etc so change this if fan etc spins when you wiggle the yellow wires as boiler wont fire if faulty

albathebrave, April 2011
link Click here to see other fixes for Ravenheat.