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overheating?

i have a ravenheat 8/20/20 thats overheating what can ido to fix it.
james gill, October 2008
not much info on fault, but could be circulation pump broken down, usually indicated by banging in boiler before it shuts down, or faulty thermostat on boiler.

mark, October 2008
link Click here to see other fixes for Ravenheat.