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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have a heat pump system with aux heat. Recently, I

Customer Question

I have a heat pump system with aux heat. Recently, I installed an Ecobee 3 thermostat and now appear to have no aux or emergency heat.
Submitted: 12 months ago.
Category: HVAC
Expert:  airheatman replied 12 months ago.

Tell me how you currently have it wired and if you remember where wires went on old thermostat

Customer: replied 12 months ago.
Old Thermostat:
Rc - Red w/ jumper to Rh
G - Green
C - Blue
W2 - White
E - Brown
O - Orange
Y1 - Yellow
New Thermostat:
Rh - Red jumper not required according to manual
G - Green
C - Blue
W1 - White
W2 - Brown
O/B - Orange
Y1 - Yellow
Expert:  airheatman replied 12 months ago.

Sorry, for some reason I did not see your reply.Are you saying your Ecobee has both a W1 and W2?

If so disconnect wire to W1.Connect the old W2 wire to W2.Tape the old E wire off

Customer: replied 12 months ago.
My apologies as well, got busy watching a hockey game Thursday night then the winter storm hit here in TN on Friday. Today, I did switch the wires on the Ecobee 3 as suggested and reinstalled the thermostat. Apparently, this thermostat is only configured to have aux heating go through connection W1 and cannot have something connected to only W2. So I left the white wire connected to W1 and disconnected the brown wire and taped it off. This appears to have done nothing as I am still without aux heating after running the test cycle on the thermostat.
Expert:  airheatman replied 12 months ago.

Try connecting to W2 instead of W1 and see if we get backup heat

Customer: replied 12 months ago.
Still no aux heat when wired per your suggestion.
Customer: replied 12 months ago.
Checked main breakers as well, all appears to be fine there.
Expert:  airheatman replied 12 months ago.

Are both white and brown hooked up in air handler?

Customer: replied 12 months ago.
Will have to double check to make sure. Might be a few minutes to get back to you...
Expert:  airheatman replied 12 months ago.

No hurry,At your convenience

Customer: replied 12 months ago.
Looks like both white and brown are hooked up, they're both going into the orange twist on. The brown bundle I'm holding onto goes to the t-stat. The only wire not connected is the black.
Expert:  airheatman replied 12 months ago.

Ignore last comment about burners,that was for someone else.

Expert:  airheatman replied 12 months ago.

The brown and whites look like all going to elements. Should be getting aux heat.

Customer: replied 12 months ago.
Is there some kind of fuse or breaker that I can look for in the air handler?
Expert:  airheatman replied 12 months ago.

I would suspect f a fuse the fan would not run either. Lets do this.Go to thermostat and connect the red and white together and see if we get heat strips to work

Customer: replied 12 months ago.
Wouldn't we need the fan to run too? How will I be able to tell if the heat strips are working?
Expert:  airheatman replied 12 months ago.

Fan should get energized through heat sequencer in heat mode, not thermostat

Customer: replied 12 months ago.
Ok, going to try this now...
Expert:  airheatman replied 12 months ago.

Standing by

Customer: replied 12 months ago.
No dice. Have them tied together with a wire nut, fan did not active.
Expert:  airheatman replied 12 months ago.

OK that answers our question. There is nothing wrong with the Ecobee. Elements and fan should have come on. Reconnect either the white or brown (doesn't matter which ) at thermostat and close it up. The problem is in air handler.

Now does ac or hea tpump work?

Customer: replied 12 months ago.
Heat pump is working, the air is just warm.
Expert:  airheatman replied 12 months ago.

OK do you have a meter to troubleshoot? For some reason sequencer is not energizing elements and blower in the aux/emer mode.

Customer: replied 12 months ago.
I do have a meter. Go ahead
Customer: replied 12 months ago.
Actually, I'll have to get back to you. Just realized what time it is...
Expert:  airheatman replied 12 months ago.

Not a problem I am here most every day.We will start by checking to see if we are getting 24v to sequencer col.