Hello folks, how do I troubleshoot an HVAC fan that doesn't stop? I wonder if it's the weather, it's so cold here down in Texas and maybe the cold is screwing up the components. There was a rotating power blackout these past few days, and when there's power we had to heat up. And a few hours later power goes out in the middle of heating operation.
I noticed today the fan keeps running (I think a bit low fan speed than when the thermostat is on heating). I have the Honeywell Whole Home Ventilation Control. I just made sure all the wires in the HVAC is connected, but I noticed this service light lights up red sometimes (I hear the switch flick that I think it wants to turn off but it can't). It's a Honeywell W8150. Normal heating operation is okay, full blow speed and heat comes in, but when the thermostat comes off, the fan still runs.
According to the manual, flashing red light during operation indicates a low voltage and it says • Check the voltage from the transformer for at least 20 Vac. If voltage is OK, replace W8150 Control. If voltage is not OK, disconnect damper and remote switch connections and check again. If voltage does not return to at least 20 Vac, replace transformer.
There was a sole transformer that was outside the HVAC system so I thought that's the transformer that powers the Whole Home Ventilation. I checked the voltage, and it only measures 19.53V, so this was my suspect so far. (reading the manual, the board is rated to be powered at 24VAC).
My question is, can a transformer be faulty due to inclement weather and/or the rotating blackouts? I've always thought transformers are built to outlive all the components in the HVAC including the circuit board. Also, can this low voltage transformer actually cause the fan to be always turned on? If so, how? This equipment is at least 15 years old.
Thank you so much for reading and any input is appreciated. Have a great day!
I noticed today the fan keeps running (I think a bit low fan speed than when the thermostat is on heating). I have the Honeywell Whole Home Ventilation Control. I just made sure all the wires in the HVAC is connected, but I noticed this service light lights up red sometimes (I hear the switch flick that I think it wants to turn off but it can't). It's a Honeywell W8150. Normal heating operation is okay, full blow speed and heat comes in, but when the thermostat comes off, the fan still runs.
According to the manual, flashing red light during operation indicates a low voltage and it says • Check the voltage from the transformer for at least 20 Vac. If voltage is OK, replace W8150 Control. If voltage is not OK, disconnect damper and remote switch connections and check again. If voltage does not return to at least 20 Vac, replace transformer.
There was a sole transformer that was outside the HVAC system so I thought that's the transformer that powers the Whole Home Ventilation. I checked the voltage, and it only measures 19.53V, so this was my suspect so far. (reading the manual, the board is rated to be powered at 24VAC).
My question is, can a transformer be faulty due to inclement weather and/or the rotating blackouts? I've always thought transformers are built to outlive all the components in the HVAC including the circuit board. Also, can this low voltage transformer actually cause the fan to be always turned on? If so, how? This equipment is at least 15 years old.
Thank you so much for reading and any input is appreciated. Have a great day!
source https://hvac-talk.com/vbb/showthread.php?2226784-HVAC-Fan-Won-t-Turn-Off-Honeywell-W8150-service-light-blinking-while-fan-runs&goto=newpost
No comments:
Post a Comment