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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have a DGH-45 Garage Heater it will start up & the glow

Customer Question

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: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

Is there a flame sensor on this unit that sticks into flame to verify burners are on?

Customer: replied 1 year 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
Expert:  airheatman replied 1 year 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?

Customer: replied 1 year ago.
I rubbed the 2 sensors then restarted it and the furnace fired up and ran for like 2 minutes then shut down again
Expert:  airheatman replied 1 year ago.

Did you get an error code when it shut down?

Customer: replied 1 year ago.
I did see any thing when it stopped working I wasn't by it
Expert:  airheatman replied 1 year ago.

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

Customer: replied 1 year 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
Expert:  airheatman replied 1 year ago.

Do you have a red light?Here is what my manual shows for sequence of operation and troubleshooting codes.

Customer: replied 1 year 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
Expert:  airheatman replied 1 year 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?

Customer: replied 1 year ago.
No I do not see any light code. Should I take a picture and send it to you
Expert:  airheatman replied 1 year ago.

That might help

Customer: replied 1 year ago.
I I tried to add and send the pictures but they won't send
Customer: replied 1 year ago.
Second thought I think you just received them
Customer: replied 1 year ago.
It is fired now with these pictures but it will probably shut off here in about 2 minutes
Customer: replied 1 year ago.
Here is a picture of all I'd pigtailed the thermostat wires together
Customer: replied 1 year ago.
There is like a heat sensor in the heater chamber could ld that be bad
Customer: replied 1 year 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: replied 1 year 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: replied 1 year ago.
Or do u think it's the thermostat simple as that
Expert:  airheatman replied 1 year ago.

So is it running with thermostat bypassed?

Customer: replied 1 year ago.
for couple minutes then shuts down. Like a relay switch shuts the gas vavle down
Expert:  airheatman replied 1 year ago.

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