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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Furnace won't run. Red and light are flashing in an

Customer Question

Furnace won't run. Red and green light are flashing in an alternating manner
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

That is model on coil.

Can you give me the complete model number on the furnace? It will be on a label on inside furnace panel just above burners.Remove panel to burner compartment and look inside. The model number will help me give accurate assistance for your specific unit.

Below is a link showing where to find label with model number:

http://i.imgur.com/EkrwIdi.jpg.

Customer: replied 1 year ago.
5906F15887?
Customer: replied 1 year ago.
Is that the right #?
Expert:  airheatman replied 1 year ago.

Just above that number

Customer: replied 1 year ago.
G43UF-48C-090-08
Expert:  airheatman replied 1 year ago.

There it is Let me grab a manual

Expert:  airheatman replied 1 year ago.

OK we have an alternating slow and an alternating fast?

Which would you say?

Customer: replied 1 year ago.
I would say slow
Expert:  airheatman replied 1 year ago.

OK lets turn power off to furnace to reset board Code means

Watchguard −− burners failed to ignite or lost flame 5 times during single heating

demand.

Then call for heat and tell me how far in sequence it goes.

1. Inducer starts

2.Igniter lights

3.Burners light

4.Circulating blower is energized.

Customer: replied 1 year ago.
Already done that several times. Not sure about 1,2,or 3. But the blower never kicks on
Expert:  airheatman replied 1 year ago.

Ok do you get the error code that it has tried to light 5 times , the very first attempt after restoring power to furnace?

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