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Tim H.
Tim H., HVAC Professional
Category: HVAC
Satisfied Customers: 3971
Experience:  Experienced in all aspects of HVAC, both residential and commercial.
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Flipped all outside breakers - reset thermo Reset internal

Customer Question

Flipped all outside breakers - reset thermo
Reset internal sws to on --no elect power to furnace ....baffled ?.
Unit worked ok .... Shut down for night ..... AM , no lite no blower -- dead
Submitted: 1 year ago.
Category: HVAC
Expert:  Tim H. replied 1 year ago.

Hi, I'm Tim and I'm an HVAC expert here to help answer your question(s). Please provide all the information I ask for since I'm not onsite. At the end of our dialog you will be asked to rate my service, but please wait until then and all your question(s) have been answered satisfactorily. Thanks for your business!

Does the unit have a blower door safety switch?

Customer: replied 1 year ago.
No
Expert:  Tim H. replied 1 year ago.

Have you measured voltage from incoming power to furnace to determine if it's a furnace problem or house power problem( circuit breaker, burned off wire, etc)?

Customer: replied 1 year ago.
AC power --ok
Expert:  Tim H. replied 1 year ago.

Where did you test this? What are you reading?

Customer: replied 1 year ago.
Checked all Breakers in Svc box ....OK
Expert:  Tim H. replied 1 year ago.

No, I mean checking power at actual furnace with a voltmeter. Let's make sure furnace is getting 120 volts.

Customer: replied 1 year ago.
If power is ok at breaker and it's in commercial conduit ...it will be 120 V at term at heater
Customer: replied 1 year ago.
it is
Expert:  Tim H. replied 1 year ago.

In order to help, we can't assume anything. If furnace is totally dead, I need a voltage measurement right at the unit where it comes in and supplies power to furnace. Other things to check, a blown fuse on the board, a bad circuit board (flip board over and look for burned areas). Also, if you can get me a full model number should I need to pull up a wiring diagram. Thanks.

Customer: replied 1 year ago.
Also checked all wire connections for looseness I ws an electrician ....
Circuit board is clean....no burned marks front or back I spent 4 hours going over this
Earlier ....ihavenot removed blower motor or checked carbons .?
Customer: replied 1 year ago.
Unit is 17 years of age
Customer: replied 1 year ago.
Cant you get aschemtic on your computer . Is there a startingcondenserinvolved - motor is located deep inside plenum...
Switched to "fan"-- also dead
Expert:  Tim H. replied 1 year ago.

Can you upload a clear picture of the wiring diagram to me here? Being 17 years old, it might be difficult to find now.

Expert:  Tim H. replied 1 year ago.

You really don't say what this unit is and no model number. Is this a forced air furnace?

Customer: replied 1 year ago.
I can't get a pict .... Never mind ... iCalledmy sonin New Mexico ...He's a heating & AC tech and will get Back to me tonight .....meanwhile I have my pellet stove !
Customer: replied 1 year ago.
Very cold today here in No Ariz.
Expert:  Tim H. replied 1 year ago.

Sorry, but without some of this basic information, I can't begin to help you troubleshoot the unit.

Customer: replied 1 year ago.
You roofed noinformtion therefore you cannot be rated
Expert:  Tim H. replied 1 year ago.

Did you still need help here?

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