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airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8247
Experience:  Furnace, A/C and heat pump specialist.
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Just came into cottage.Blower running but no heat.Heat was

Customer Question

Just came into cottage.Blower running but no heat.Heat was set at 50 and room was about 50.
Raising thermo did not create heat. 4 flashes says "open limit device". ? This is an American Standard freedom 90 natural gas
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

Lets start by checking for resettable limits near burners that might push in to reset.