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Honeywell thermostat screen is blank. It does not have

Customer Question
Honeywell thermostat screen is...

Honeywell thermostat screen is blank. It does not have batteries. Breaker was not tripped and emergency switch is on. It’s running but my screen is blank and house is freezing

Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat?

Just thermostat. The unit is actually running. The filter needs to be replaced but that doesn’t impact the display svreen

Contractor's Assistant: Do you plan on doing the work yourself?

Yes

Submitted: 8 months ago.Category: HVAC
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Customer reply replied 8 months ago
TH9421C1004
Answered in 6 minutes by:
12/8/2017
HVAC Technician: HVAC Guru, HVAC TECH replied 8 months ago
HVAC Guru
HVAC Guru, HVAC TECH
Category: HVAC
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One moment please..Note it takes time to type and add links so please be patient. Also the site will send you a phone call offer, that is not me.

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HVAC Technician: HVAC Guru, HVAC TECH replied 8 months ago

What likely happened is the low voltage fuse in the furnace or airhandler blew. There typically is a SLOT STYLE 3-5AMP FUSE on the board itself inside the furnace/airhandler like this.

CLICK HERE

If that is burned out all power to the thermostat will be lost. 95% of all units use some sort of SLOT FUSE or inline BUS STYLE FUSE to protect the low voltage circuit. You need to find that and change it out. If you just bump two wires together you could have just popped it without even knowing it. Now if for some reason your unit does not use a fuse often the board will be damaged due to the short. You would need to confirm you have 24 volts to the board inside the furnace/airhandler with a volt meter to make sure though.

Note if you have a condensate pump check the float and make sure the pump is not full of water...as that could cut low voltage power to the unit as well if the pump is not working and full of water

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Customer reply replied 8 months ago
There is a condensation pump and it’s full but not spilling over.
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