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Mend Bosch Thermostat Heating Faulty

How can I fix my boss therm?

I recently replaced the batteries on my thermostats the other day the front display looks like it is working however I have had no heating since replacing these batteries, I presume this is not registering with the main controls, I have checked the back and no lights are coming from the test or learn lights, is this faulty ?

Tracy
April 2014
BoschHeating, Home Heating SystemsThermostat Heating Faulty

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Bosch Thermostat No Heat - Fix & Troubleshooting