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Mend Manual Code 04

dont have user manual what is error code 04 ?

dont have the user manual and it reads error code o4 what would this tell me

ms mullaney
July 2009
Heating, Home Heating SystemsManual Code 04
04: fatal error between operator and appliance.

t
July 2009
lets guess what boiler you have.
don't think so, go away.

andy pandy
July 2009

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Error Code 04 - Troubleshooting & Meaning