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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Well replaced bad blower motor and now furnance ignites and

Customer Question

well replaced bad blower motor and now furnance ignites and fires for few seconds then goes out. have to trip breaker to gat to try again.
JA: I'll do all I can to help. How long have you been dealing with this?
Customer: just an couple hours
JA: Do you plan on doing the work yourself?
Customer: yes, replaced blower motor and cleaned all those componets then reassembled. trying to save our church money
JA: Anything else we should know to help you best?
Customer: been on line trying to find manual for this old trane tuc120b960a0 with White-Rodgers 50e47-60
Submitted: 8 months ago.
Category: HVAC
Expert:  airheatman replied 8 months ago.

After burners ignite, does blower ever come on before it shuts down?

Customer: replied 8 months ago.
no
Expert:  airheatman replied 8 months ago.

OK do you have a multi meter for troubleshooting?

Customer: replied 8 months ago.
no, but blower runs on fan only and when ya kick to cool auto
Expert:  airheatman replied 8 months ago.

I am suspecting you may have an issue with control board.Does new motor do same thing old motor did?

Customer: replied 8 months ago.
old motor would hardly turn bushing bad. had professional at ragdon electric in st, joseph mo get correct replacement
Customer: replied 8 months ago.
white Rodgers 50e47-060
Expert:  airheatman replied 8 months ago.

OK the motor gets its signal from relays on the control board.Different relays for heat cool and fan.So fan and cool can be ok but heat relay not closing. Do you get any error code on board other than the open limit code after it shuts down?

Customer: replied 8 months ago.
flashes quickly then stops
Expert:  airheatman replied 8 months ago.

Any pattern to flashes like shown below?

Customer: replied 8 months ago.
happens so fast and the thermaste is upstairs and furnance down and I only one here
Expert:  airheatman replied 8 months ago.

OK now the model you sent me was for an ignition module, not blower control board.Do you see a different board that fan wires connect to?

Customer: replied 8 months ago.
I will go look computer is in different part of building it will take me a few minutes OK? breaker is in same room as furnance I can flip breaker off go up set thermasate come back flip breaker on count flashes.
Expert:  airheatman replied 8 months ago.

Sounds good

Customer: replied 8 months ago.
on it, try to see if I can catch you on my phone text should same account please wait
Expert:  airheatman replied 8 months ago.

Take your time.I am working on a couple of projects but will keep an eye out for your reply

Customer: replied 8 months ago.
OK one slow flash then burners lit fired for about 90 seconds then went out exhaust fan running. No more flashes and only one firing.
Expert:  airheatman replied 8 months ago.

OK if burners stay lit for that long and blower does not come on we are not getting power to motor. Do this, Turn fan to FAN ON and see if furnace will stay lit

Customer: replied 8 months ago.
Will furnace light with fan running before heats up
Expert:  airheatman replied 8 months ago.

Yes

Customer: replied 8 months ago.
It's not lots of small clicks but not firing
Expert:  airheatman replied 8 months ago.

Fan on should not effect burners from lighting, Disconnect the low speed fan wire.

Customer: replied 8 months ago.
Fan kicked on
Expert:  airheatman replied 8 months ago.

OK how about burners?

Customer: replied 8 months ago.
Nothing
Expert:  airheatman replied 8 months ago.

OK go ahead and put wire back. You are going to need to get a meter and check to see if we get voltage to motor on low speed after burners come on.Since motor is new, I am suspecting relay not closing sending power to motor.

Customer: replied 8 months ago.
How late will you be on line? It will take me at least 40 minutes to run home and back with meter. I can leave web site up here at church. Then come back
Expert:  airheatman replied 8 months ago.

I will be here for awhile yet.If I have to leave,I can open to other experts so you are not left hanging

Customer: replied 8 months ago.
hello I am back with meter. what setting an what do I check?
Expert:  airheatman replied 8 months ago.

Do you see a wiring diagram maybe on blower panel inside that you can take a pic of? I have not been able to find wiring diagram online

Customer: replied 8 months ago.
I will go check,
Expert:  airheatman replied 8 months ago.

Thanks

Customer: replied 8 months ago.
Just for turning on gas, no other
Expert:  airheatman replied 8 months ago.

OK tell me where the fan wires connect.If you can get a clear picture showing the fan wires where they connect with spade clips will help

Customer: replied 8 months ago.
anybody there? wires go to relay I sent pictures did they come through?
Expert:  airheatman replied 8 months ago.

Still waiting on pictures

Customer: replied 8 months ago.
ill try sending again
Expert:  airheatman replied 8 months ago.

Standing by

Customer: replied 8 months ago.
Expert:  airheatman replied 8 months ago.

Thanks. The red and white wires should be common and low speed.So what we want to do is put meter on red and white.Turn furnace to call for heat.30 seconds after burners light we should get 120v between red and white.

Customer: replied 8 months ago.
ok I will run down give a try
Expert:  airheatman replied 8 months ago.

Let me know

Customer: replied 8 months ago.
Vac or vdc AC correct
Expert:  airheatman replied 8 months ago.

VAC

Customer: replied 8 months ago.
furnance did not fire this time will try again after turn breaker off and back on
Expert:  airheatman replied 8 months ago.

You may be best to call in a tech at this point.I believe you may have more than one issue going on here, Furnace should do same thing everytime.

Customer: replied 8 months ago.
You mean local person in my area
Expert:  airheatman replied 8 months ago.

Yes. I can request a refund if not happy , but this is seemingly more than one issue.

Customer: replied 8 months ago.
Well the first message sent said it was a $5.00 refundable fee but then ask for payment of $28.00 which I did because we need church furnace working. How much just for this one time?
Expert:  airheatman replied 8 months ago.

The total should be the 28.00 but I can request a refund since we did not solve if you choose although I have spent time on this, my main goal is to help.

Customer: replied 8 months ago.
Is the $28 good for other questions and for entire month? Thanks
Expert:  airheatman replied 8 months ago.

It is a one time fee for this question

Expert:  airheatman replied 8 months ago.

I can also opt out and see if another expert may be more help.If not just request refund rather than rating

Customer: replied 8 months ago.
I sorry but I would like a full refund and cancel my monthly redrawl from paypal account since the original price quote was a refundable $5.00.
Customer: replied 8 months ago.
its gonna cost at least $75 just to get someone out to our church just look