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I have an 18 month old Carrier furnace and infinity touch…

Customer Question
I have an 18...

I have an 18 month old Carrier furnace and infinity touch control thermostat, in the last 2 weeks a pop up screen shows "SYSTEM FAULT 13-LIMIT LOCKOUT and the furnace will not heat. The service tech checked and reported no problem with the furnace. I asked for the thermostat to be replaced, ?Is there a battery to replace? as this would be a simpler option?PS no power outages or problems at the pannel.

Contractor's Assistant: Did you double-check the thermostat's settings? And what about the filters?

The settings are ok, and all the filters have been changed

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

I have a waranty plan, but we live in Toronto and it is -14C so if a simpler option as it seems to be ok if I reboot the thermostat

Contractor's Assistant: Anything else we should know to help you best?

Just curious if it is as simple as changing a battery in the thermostat

Submitted: 7 months ago.Category: HVAC
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Answered in 8 minutes by:
12/28/2017
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 months ago
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 23,151
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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Hello,

My name is Billy. This means the unit overheated. It can be caused from too restrictive of a filter, blower issues, too small ductwork etc...pretty much anything that restricts air flow.

Code 13 is pretty common but is also a sign that more air flow is needed. This will not be related to the thermostat as the thermostat only reports what the furnace sends to it.

Billy

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Customer reply replied 7 months ago
thank you, ***** ***** checked, but after putting all my snow gear and in light of day saw that one of the ducts to outside was piled with snow.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 months ago

That can certainly contribute....also make sure the filters you use are not too "good". Some of the high density filters actually mimic a plugged filter because they are so fine to catch smaller particles.

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