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Mend Myson Apollo Thermostat Boiler Heating

How can I change a thermostat in an old Myson Apollo boiler?

How can I change the high thermostat in a Myson Apollo boiler. It's about 10 years old. I've bought the thermotat but can't find where to put it.
Many thanks

Paul Hobbs
October 2007
MysonMyson ApolloHeating, Home Heating SystemsThermostat Boiler Heating
Remove both covers,at top right corner there is a small box shaped cover held on by one screw,remove cover by sliding forward on pipe. The high stat has YELLOW and BROWN wires on it. Easy job I have done it a few times on my 25yr old boiler.

Clive
November 2007

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Myson Apollo Thermostat Replacement - Guide