I have a lennox heat pump and heater unit all electric. A couple of
days ago i noticed the indoor unit was making a humming sound. i turned
down the thermostat and it stopped when the compressor stopped. I
checked the filters and they were dirty but not clogged but I replaced
them. just to be on the safe side i backed off the thermostat to get
through the holiday. If i let the house cool down to about 65 i can
turn the unit on and set the thermostat for 75. the aux heat comes on
and will heat to about 70 and the it drops off and the heat pump kicks
in. it still heats but after a few minuets the fan stops and the indoor
unit just humms. once the compressor shuts off it stops . after a few
min the unit will come back on and the whole procession starts over.
the fan works fine with aux heat but after a few on the heat pump the
humming starts. Please help

Since noone is replying with help..I found this site that may help you
out. Copy and paste your post here to this site. It is a Lenox Heat
Pump support forum.

http://www.cozyparts.com/lennox-part... &whichpage=1

The full model number would be helpful also if you could provide that.
I will help you search it out online.

http://www.lennox.com/owners/archived-docs.asp

I have a lennox heat pump and heater unit all electric. A couple of
days ago i noticed the indoor unit was making a humming sound. i turned
down the thermostat and it stopped when the compressor stopped. I
checked the filters and they were dirty but not clogged but I replaced
them. just to be on the safe side i backed off the thermostat to get
through the holiday. If i let the house cool down to about 65 i can
turn the unit on and set the thermostat for 75. the aux heat comes on
and will heat to about 70 and the it drops off and the heat pump kicks
in.

Not an expert on heat pumps, but this doesn't sound right. Isn't the
aux heat supposed to work together with the heat pump, assuming the
outside temp isn;t too low? I don't think this is the real problem,
but it could be a thermostat settup issue that is costing you money by
relying more on aux heat than necessary.


it still heats but after a few minuets the fan stops and the indoor
unit just humms. once the compressor shuts off it stops . after a few
min the unit will come back on and the whole procession starts over.
the fan works fine with aux heat but after a few on the heat pump the
humming starts. Please help

Can you identify what exactly is humming? And is the heat pump
providing heat, (without aux heat) or is it not working and just
humming?

thanks giving it a try
avid_hiker wrote:
Since noone is replying with help..I found this site that may help you
out. Copy and paste your post here to this site. It is a Lenox Heat
Pump support forum.

http://www.cozyparts.com/lennox-part... &whichpage=1

elite 10 model cb29m-46-1p thanks
avid_hiker wrote:
The full model number would be helpful also if you could provide that.
I will help you search it out online.

http://www.lennox.com/owners/archived-docs.asp

lear60 wrote:
elite 10 model cb29m-46-1p thanks

I found what you have is a " Coil Blower Unit ( indoor Evaporator and
Blower in same unit ) ; it is NOT a Heat Pump.

From the Model number you provided......CB29M-46-1P..........CB=Coil
Blower Unit, 29=Series, M=Configuration (multiposition ), 46=Capacity,
1=revision, P=voltage (208/230v 1 phase 60hz)

If you go to the above lennox site you will see a link under product
guides/heating and cooling, I believe this might give you some insight
and some checks to do on your thermostat, etc.

And from the thermostat settings......what happens when it is set to
Cont (continuous)? This will run the fan/blower continuously, which is
reccomemded by Lenox. Decribe what the thermostat settings are at the
moment, if you can.

Otherwise I am still searching for you. Take care.

http://www.lennox.com/pdfs/manuals/L...M%20Manual.pdf

Service manual / with wiring schematics
http://www.hvac-direct.com/pdf_files...on/504719c.pdf

I believe the tremostat is set incorrectly, or according to
schematics..that only one heater element is working or
relay/transformer.........if you have a multimeter and can
troubleshoot.......these wiring diagrams will be very handy.

Service manual / with wiring schematics
http://www.hvac-direct.com/pdf_files...on/504719c.pdf

I believe the tremostat is set incorrectly, or according to
schematics..that only one heater element is working or
relay/transformer.........if you have a multimeter and can
troubleshoot.......these wiring diagrams will be very handy.