HVAC Questions? Ask an HVAC Expert for Answers ASAP
Is the outdoor unit cutting off when the heat call is over it is just that the indoor air handler continues to blow heat?
there is no outdoor unit...just the airhandler in the crawlspace
okay so the airhandler is the primary source of heat.
you have a bad sequencer.
do they still use sequencers on new units? This unit was installed in 2007
If the poles on this sequencer stay closed when there is no 24v applied to the bottom it will leave the heat blowing none stop.
the blower and the heat are on two different circuits...the blower is on a 30amp and the heat is on a 60amp
The blower power comes off this sequencer and also off the control board fan relay.
When there is a heat call the sequencer is energized and powers the blower
If there is a cool or fan "on" call the sequencer isn't energized and the G wire is and this powers the blower through the control board.
the heat and the blower will both stay on ...the only way to turn off heat and blower it at the breaker
There is a sequencer in the unit looks just like this one I gave you a picture of. It is the problem. If you take a voltage reading at the bottom pole where the 24v comes in which is the white and brown thermostat wire and the blue common wire and there is no 24v there but the heat and blower are on then the sequencer is stuck in the closed position and powering everything all the time.
i had did some research before the tech came out and saw some people said something about sequencers. I asked the tech if this could be the problem and he said he didn't htink it had a sequencer...
you may have this type
this what what he replaced
this is a VDC type sequencer looks different then a 24v
he replaced that little black box?
trying to paste the weblink to the board
There are different types of these goodman heat kits. Depending on the type will be the sequencer so if you could find me the HKR number on your heat kit that would help.
This may be what the sequencer on your heat kit looks like
There is the part he replaced: http://www.americanhvacparts.com//Merchant2/merchant.mvc?Screen=PROD&Product_Code=CIB1370735&Catergory_Code=cb-goodman
That is the fan relay board
great...so we spent a week waiting for a part that we probably didn't need. wonderful
There is a sequencer on the heat kit. The heat kit is an accessory part that doesn't come with the air handler it is field installed. mounted on this kit along with the limits and heat elements is one of the two types of heat sequencers I sent pictures of.
that board would only be the problem if the blower ran all the time without the heat on with it.
If the heat is on then it is the sequencer.
ok....thank you for your help
do you have any part numbers that it could possibly be?
B1256559 or B1370783
Most of them are the B1256559 there aren't very many of the HKR-##C models out there that use the VDC relay the B1370783
Can I still run the heater with a bad sequencer until the part arrives? I have been turning the unit on and off at the circuit breaker to heat the house up.