Blower Pulses On and Off Every 2 Seconds - http://www.hvacmechanic.com/ Forums
Original message
| FSUDAL
 |  "Blower Pulses On and Off Every 2 Seconds"
, posted Tue 2 Sep 19:04  
My Bryant Plus 90i Residential Heating/Cooling unit's blower motor pulses on and off every few seconds. However, if I change the thermostat fan setting from AUTO to ON the blower will continuously run properly on the low setting and then kick on high while cooling (everything works fine). I believe that I have an ECM that does not have a run capacitor (see pics). What do you think could be causing this?
http://hvac-talk.com/vbb/attachment.php?attachmentid=8952&d=1220372970
http://hvac-talk.com/vbb/attachment.php?attachmentid=8951&d=1220372954
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Replies:
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| theduke03
| "Re(1):Blower Pulses On and Off Every 2 Second" , posted Tue 2 Sep 20:27:
What is the model# of furnace? Is there a blinking LED code?
"My dad was the most feared furnace fighter in Northern Indiana."
[this message was edited by theduke03 on Tue 2 Sep 20:44] |
| | FSUDAL
| "Re(2):Blower Pulses On and Off Every 2 Second" , posted Tue 2 Sep 21:04
Thank you for your reply. The model number is 355MAV060120 FHKA Series H. The amber LED status light is on and does not blink.
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| | theduke03
| "Re(3):Blower Pulses On and Off Every 2 Second" , posted Wed 3 Sep 16:24
I think it's the thermostat.
"My dad was the most feared furnace fighter in Northern Indiana."
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| | FSUDAL
| "Re(4):Blower Pulses On and Off Every 2 Second" , posted Wed 3 Sep 20:37
It looks like the original thermostat may be discontinued ( http://www.bryant.com/products/controls/thermidistat.shtml ) but I can still find them on ebay for about $169. Any recommendation on a thermostat that would be compatible with my system and take full advantage of it (humidity control...)?
Also, due to the cost of the part, is there a way to test if it is the thermostat?
Thanks again for your help.
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