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PostHeaderIcon T8665 & W8665 Wireless Honeywell Thermostat Combo System. Reviews, Ratings, And Information.

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Enjoy easy control of your indoor environment combined with the freedom of choice with the T8655A Chronotherm IV wireless thermostat. This versatile unit supports conventional gas, oil, or electric applications (1-heat, 1-cool). The T8655A requires the W8655A receiver module for operation; when used in conjunction, this dynamic duo lets you place the wireless thermostat anywhere in your home for the ultimate in convenient control. Seven-day programming lets you select settings that suit your lifestyle. Convenient features include a one-touch Daylight Savings Time key and a copy key for easy programming. The large backlit liquid crystal display is easy to read. Choose the T8655A and W8655A and discover affordable, convenient control like you’ve never imagined.

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7. Which Brand Is It?

Source: Air & Water Filter Reviews!

Why is my honeywell chronotherm IV thermostat screen blank?

Jun 26, 2009 by DC | Posted in Maintenance & Repairs


Also, the circuit breaker did not trip, and the thermostat appears to be fine as I tried using it on another unit in the house and it worked fine. Should I contact an HVAC company or there something simple I am missing?

It sounds like there is a loose connection either in the sub bases or at the furnace. Typically when those stats go bad they just go.
buy a new one and if the new one has the same problem, just return it and call a hvac tech. you may need a new 24v transformer installed or even a new control unit if that is the case.
~i don't think its a circuit breaker. the thermostats work off the same power as the furnace.

Peter Ian Staker | Jun 26, 2009

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