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Mend Siemens Home Heating Systems

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Siemens thermostat?

My thermostat is showing the numbers 666 and the letters EEEE i can't change it back to the clock any ideas pkease.

Richard Glendinning
October 2018
Mend Heating, Home Heating Systems
Mend repair fix Siemens home heating systems

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Mend Heating, Home Heating Systems
Mend repair fix Siemens home heating systems