Have HVAC Questions? Ask an HVAC Expert for Answers
If you turn the thermostat to FAN ON, does the blower come on?
No, fan is silent
Do see any lights on the control board when looking through ins[pection window on bottom panel?
Please explain a bit more. I have removed a front cover. Where do I look to see ?
I need to go down to the furnace and check. Do you have any picture to help me where to find place where ;ight should be?
Ok I found the little round window. I see no lights inside.
Can you get me a model on the furnace? 90+ is the series. Usually there is a control board in the blower compartment.Will normally have an LED light on the board to indicate power is present
OK please just few minutes.
Have any electrical breakers been turned off
I am back from the basement. Breakers are OK. Furnace is on breaker 15. It is not off.
Do you have a voltmeter to check voltage to the furnace?
Serial number unfortunately I am not able to find it. Inside of the front furnace cover arre stickers with electrical diagrams and installation diagrams but I see no serial number. I know that it is BRYANT Pulse 90t High Efficiency 2 stage furnace.
I have a voltmeter.
Can you first verify that we have 120 volts going to the control board betwen L1 and Neutral
What is important to consider is that When I turned on the furnace the usual ways: 1) main Furnace switch in the ON position.
Lets verify we are getting power to the furnace, then we can start diagnosing why not coming on
LED Status Code
CONTINUOUS OFF - Check for 115VAC at L1 & L2, & 24VAC at SEC-1 & SEC-2.
CONTINUOUS ON - Control has 24VAC power.
RAPID FLASHING - Line voltage (115VAC) polarity reversed. If twinned,
refer to twinning kit instructions.
This indiactes we do not have power to the control board if you do not have an LED light on
I am happy you got your furnace working.As you can see from the amount of time it took the tech to locate the problem., troubleshooting is step by step process.The request for your model number is so I can pull a manual and give you accurate instructions relative to your specific furnace.We at JustAnswer do our best to provide you with accurate information and answers. THanks for allowing me to assist you.