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I have a DGH-45 Garage Heater it will start up & the glow…

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I have a DGH-45 Garage...
I have a DGH-45 Garage Heater it will start up & the glow plug will kick in like 3 time then shuts down. there is gas to the unit. On the switchboard the green light does nothing. What the problem to check.
Submitted: 2 years ago.Category: HVAC
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Answered in 15 minutes by:
1/19/2016
HVAC Technician: airheatman, HVAC Technician replied 2 years ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,367
Experience: Furnace, A/C and heat pump specialist.
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Is there a flame sensor on this unit that sticks into flame to verify burners are on?

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Customer reply replied 2 years ago
All I see is the glow plug igniter.there are 2 round sending units at the top and bottom of the gas ports I thought those to be heating sensors
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

I understand. They used separate flame rod on some and igniter s the senser on other.Does the flame actually ever come on? And if not do you have a volt meter to see if we are getting power to the gas valve?

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Customer reply replied 2 years ago
I rubbed the 2 sensors then restarted it and the furnace fired up and ran for like 2 minutes then shut down again
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Did you get an error code when it shut down?

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Customer reply replied 2 years ago
I did see any thing when it stopped working I wasn't by it
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Try again and as soon as it fails look for a code.

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Customer reply replied 2 years ago
I got it to fire a second time for like 2 minutes and then it shut down with the green light on the main board did nothing
Customer reply replied 2 years ago
Up in the heater where the thermostat wires connect I hook them together to over ride the thermostat ran for 4 minutes then shut down
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Did you see my question about the red light on ignition control and if so do you have one and does it give us a code?

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Customer reply replied 2 years ago
No I do not see any light code. Should I take a picture and send it to you
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

That might help

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Customer reply replied 2 years ago
Second thought I think you just received them
Customer reply replied 2 years ago
There is like a heat sensor in the heater chamber could ld that be bad
Customer reply replied 2 years ago
There are blue two wires that go to the back of unit where the heat chambers are behind the two red wires that go up to the glow plug would that be the heat sensor that I'm talking about that could be bad?
Customer reply replied 2 years ago
The one blue wire comes from the main switchboard then goes to the right side of the gas ports to the heat chamber for the top and bottom parts that I talked about earlier.
Customer reply replied 2 years ago
Or do u think it's the thermostat simple as that
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

So is it running with thermostat bypassed?

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Customer reply replied 2 years ago
for couple minutes then shuts down. Like a relay switch shuts the gas vavle down
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Can you just for attest bypass the pressure switch and then limit to see if it will stay running?

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