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BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22629
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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The batteries in my Honeywell thermostat went out last night.

Customer Question

The batteries in my Honeywell thermostat went out last night. After replacing them I can not get my AC or my heat to work. My Goodman furnace is showing "6 Blinks" on the board. It is summer in Michigan so I have not had the heat on in some time; is it possible to still have an issue with the rollout limit switch or is more likely to have an issue with the 24 volt system running to my thermostat?
Submitted: 2 years ago.
Category: HVAC
Expert:  BillyHvac replied 2 years ago.
check the fuse on the circuit board. It codes the same as an open roll out.
Any damage to thermostat wire outside can blow this is a blade type fuse, yellow 5 amp.