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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
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: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

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

Customer: replied 1 year 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 1 year 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 1 year 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 1 year ago.

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

Customer: replied 1 year ago.
Still no aux heat when wired per your suggestion.
Customer: replied 1 year ago.
Checked main breakers as well, all appears to be fine there.
Expert:  airheatman replied 1 year ago.

Are both white and brown hooked up in air handler?

Customer: replied 1 year ago.
Will have to double check to make sure. Might be a few minutes to get back to you...
Expert:  airheatman replied 1 year ago.

No hurry,At your convenience

Customer: replied 1 year 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 1 year ago.

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

Expert:  airheatman replied 1 year ago.

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

Customer: replied 1 year ago.
Is there some kind of fuse or breaker that I can look for in the air handler?
Expert:  airheatman replied 1 year 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 1 year 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 1 year ago.

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

Customer: replied 1 year ago.
Ok, going to try this now...
Expert:  airheatman replied 1 year ago.

Standing by

Customer: replied 1 year ago.
No dice. Have them tied together with a wire nut, fan did not active.
Expert:  airheatman replied 1 year 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 1 year ago.
Heat pump is working, the air is just warm.
Expert:  airheatman replied 1 year 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 1 year ago.
I do have a meter. Go ahead
Customer: replied 1 year ago.
Actually, I'll have to get back to you. Just realized what time it is...
Expert:  airheatman replied 1 year 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.