I will try to give all the information that I can.

I have a Rheem RBHA (?) Heat Pump/Electric Heat Furnace unit, one of 2 units that we have in our house (the downstairs unit is a Rheem Gas furnace). The downstairs gas unit is fine. However, upstairs, the electric unit won't budge. No fan, some heat from upstairs, but that's it. No circulation whatsoever.

Some history. The units are 8 years old, if that. About 3 months ago, the outside heat pump was having issues, which turned out to be the motor, which was replaced. After that, the units worked fine. Also, when we moved in about 6 months ago, I replaced both the upstairs and downstair thermostats with digital Honeywells, which work fine. In fact, as of about 3 weeks ago, when we had a brief "heat wave", the A/C kicked on without issue, along with the fan upstairs.

When we tried to swtich to heat last week, the gas furnace and fan was fine, but upstairs, nothing. I hear the thermostat swtich to heat, but the fan doesn't budge, either in Auto or On mode. I had the fuses checked, and they're fine. The housing that holds the fuses (not the box) is cracked, but the contacts are clean and fine as well. I can spin the fan and it spins very freely, so nothing is jamming it. I do not see any switch or reset button on this model (if there is one, I'm all ears). I also know that "juice" is flowing to the unit (I may have shocked myself a bit, inadvertantly) and have checked/reset the circuit breaker downstairs, without effect.

But as it is now, before I start calling HVAC, I'd love to hear from folks as to what the culprit might be.

Thanks in advance.

Mike

 

It's also worth noting that the therostats are Honeywell RTH7400D's. I may have configured them incorrectly. On the setting for the type of Heat/AC (170), I originally had set it to 7 for multi stage heat pump, but switched it to 1, so that I could use the next setting, 180, and try to call the heat/fan from the stat. So far, still nothing.

Thanks

Mike

 

Does the blower start if you turn the fan switch on the T-stat to on?

if so I say you have a bad sequencer in your furnace, or Your T-stat is not right for some reason.

What is the Kw rating on the unit?

Or the rest of the model Number will do.