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protherm combi not firing on ch or h/w f1 coming up?

before i had turn off c/h flow & return valve and it was firing on ch but not on H/W after i turn the valve on now not firing at all and sowing f1 sign

babu
November 2013
Heating, Home Heating SystemsNot Ch F1 Up

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Mend Home Heating Systems
Mend Heating, Home Heating Systems
Free repair help for home heating systems