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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Hope you can.

Customer Question

Hope you can.
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

Can you provide more details.

1.Model on unit

2.What you are referring to as fan terminator switch

3.Do you have a volt meter for troubleshooting?

Customer: replied 1 year ago.
Wish I could tell you the manufacturer name of furnace. The control board is White Rogers 50E47-843.The Tstat with manual reset is by the blower. That is to what I was referring to as terminater switch.Voltmeter is non existent now. I was headed to town to grab one when I found this site.
Expert:  airheatman replied 1 year ago.

I would need model on furnace and you would need the meter to troubleshoot.If it is a gas furnace, model should be on a label on inside panel above burners.

Customer: replied 1 year ago.
Okay. I will go get a new voltmeter.Colman Evcon.
Expert:  airheatman replied 1 year ago.

Sounds good, look for the label either inside right or inside let above burners for model. Let me know when ready to troubleshoot.

Customer: replied 1 year ago.
Okay. Town is a fair distance away. I will let you know.
Expert:  airheatman replied 1 year ago.

Sounds good.

Customer: replied 1 year ago.
DGATO56BDC
Customer: replied 1 year ago.
I have a voltmeter as well.
Expert:  airheatman replied 1 year ago.

Excellent. Or first step is going to e to determine if we have 120v into the transformer and 24 volts out.See diagram below

Customer: replied 1 year ago.
Where is this located?
Customer: replied 1 year ago.
This is the unit.
Expert:  airheatman replied 1 year ago.

Have to step away but will be right back.

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

Sorry about the delay.My daughter stopped by with my grandkids.I am back.Transformer will look like this.May be inside this panel.

http://i.imgur.com/KzlQV4s.jpg

Customer: replied 1 year ago.
Okay. Red. Black. Yellow. Pinkish.
Expert:  airheatman replied 1 year ago.

I can not see wire colors good in photo, but two going in from main power should read 120v and two coming out to thermostat and controls should read 24 volts

Customer: replied 1 year ago.
Have a black reading 120. Red reading 24.
Expert:  airheatman replied 1 year ago.

Next check on board between Neutral and XFMR and between neutral and L1,See below

Customer: replied 1 year ago.
If I have the correct ones they both read 124.
Customer: replied 1 year ago.
120.
Expert:  airheatman replied 1 year ago.

120v at both places?

Customer: replied 1 year ago.
Are those spots you shown on the diagram the coils? The two black things to the right of the transformer?
Expert:  airheatman replied 1 year ago.

Those are the terminals on the board

Customer: replied 1 year ago.
Okay. I only see L1 listed.
Expert:  airheatman replied 1 year ago.

L1 and neutral are power in to board and XFMR and Neutral are power out to transformer. Also check for 24v on board between 24VAC and COM

Customer: replied 1 year ago.
The diagram is making me confused. Sorry. I am also not seeing xlmr on the board.
Expert:  airheatman replied 1 year ago.

Ok I am looking at furnace diagram.It shows the terminals I listed. Lets do this, Checj for 120v between these two terminals L1 and L2

Customer: replied 1 year ago.
120v
Expert:  airheatman replied 1 year ago.

OK sounds like you have a defective board if we have 120v to board but light is not lit.

Customer: replied 1 year ago.
It worked previous to the installation of new blower and upper reset switch. Turned off all power at the box before installation or removal.
Customer: replied 1 year ago.
I say box meaningbreaker box.
Expert:  airheatman replied 1 year ago.

Lets do this, Turn thermostat to heat and see if we get 24v between TH and TR

Customer: replied 1 year ago.
Nothing.
Expert:  airheatman replied 1 year ago.

Bypass the limit you put in and lets see if we get the 24v

Customer: replied 1 year ago.
Would a paperclip work?
Expert:  airheatman replied 1 year ago.

Absolutely just make sure it can not touch cabinet or anything that would short it

Customer: replied 1 year ago.
If it absolutely is the control board, does it have to be this exact one or may I get an alternative one with the same specs?
Customer: replied 1 year ago.
Nothing registered.
Expert:  airheatman replied 1 year ago.

Try connecting R and W at thermostat and bypass thermostat.

Customer: replied 1 year ago.
Not seeing R or W at the thermostat.
Expert:  airheatman replied 1 year ago.

How many wires to thermostat and where do they connect?

Customer: replied 1 year ago.
Sidnt take off thermostat where coil is. 5 wires. W peachish. Y yellow. Rc blue. RH red. G green. Then a white going from Y to the board at a spot without a marking.
Expert:  airheatman replied 1 year ago.

Connect the white from RH and peaches from W together

Customer: replied 1 year ago.
Got it.
Customer: replied 1 year ago.
Nothing is happening. Hope we can get this resolved. We are going to have a hard freeze tonight and the pipes will freeze if the central heat isnt running.
Expert:  airheatman replied 1 year ago.

I am going to open this to other experts who may be able to assist you quicker. If you prefer to just call in an onsite tech to get this solved so pipes do not freeze might be best ting to do.If no other expert can help, you can request a refund of your deposit.

Customer: replied 1 year ago.
Okay. I think a phone call might just be the thing to do. I do appreciate your help.