Model DGAA077BDTA Flash Codes 3 & 4

[stevecc]

Ever Since we purchased this furnace 7 years ago it has caused us problems. We have not gone a single year without something needing to be fixed. I am fed up with the escalating costs.

Could you please give me an idea of what could be wrong when the lights flashes 3 and 4 times when the furnace tries to run. When we first turn it on it flashes 3 times. Then as it tries to cycle it continuously flashes 4 times. Does it need a limit switch replaced?

The company we bought the furnace from is completely incompetent and I have been waiting for almost two weeks just for them to contact me about the problem. PLEASE HELP!!

[Mark]

I'll let Robert respond with any help he may be able to give. Below is a list of what the flashing lights mean for the 7990-320P (also known as 031-01932-002) board in your furnace.

Steady light on - normal operation.
One flash - ignition failure.
Two flashes - combustion air switch stuck closed.
Three flashes - combustion air switch failed to close.
Four flashes - limit switch open.
Five flashes - gas valve energized with no call for heat.
Rapid flashing - reversed polarity.
Note: Color of light is green.

[Robert]

Has the pressure switch been checked and/or replaced ?

That is the 3 flashes.


For four flashes, check all limit switches.


I would not do anything though until after the recall inspection and repair is complete.



Take care and best wishes,
Robert