Ruud heat pump strips heat no fan

Bobwoodberry

My Ruud heat pump heat strips will come on with no fan and I can smell the burning through the registers. I changed the fan relay twice and also installed a new thermostat and it still happens. Help I'm worried my house will burn down

Bobwoodberry

When I installed the t-stat I was told to put a jumper between the black and white leads so I would get a higher temp through the registers. Could this have caused the problem. There are no patterns unit can sit idle for over an hour and starts heating no fan or sometimes it has just satisfied and the stripe will cut in with no fan. Help I'm worried
Thanks to any replies
Bob

thermal-medics

1. when did this start, I mean the first time you noticed it? or just out of the blue...

2. did you do anything to the unit before this happened? (change t-stat etc)

3. Can you select the fan motor from auto to 'on' and will it come on?

your first instint might be right about the jumper at least back up and simplify everything again to try and get it to a normal operating layout.


model number of the rude ruud

Bobwoodberry

model # UBHC-17J11SFD
I'm thinking that if this doesn't work to change the heat sequencers/contacts. I'm a Cabinetmaker so alot of this stuff is weird to me. My Dad was great with this stuff, but he's gone now so no advice. I really do appreciate your time.
Bob

thermal-medics

Thats what I would do. 1. remove jumper - see if it operates normally if not 2. Re-install old t-stat, if you still have it, same way as it was and ck operation. 3. if number 2 is not an option double check programming at t-stat for operation using the manual. ( i think they are confusing as h3ll). If none of that does anything to correct it:
4. Recheck wiring at relay you changed just to make sure you are good there.

5.dig out a schematic (let the fun begin)

K.I.S.S. principle then move on to more complicated from there.

There should be some other ideas coming along soon...

beenthere

What terminal is the black wire on, and what terminal is the white wire on, of the thermostat.

hvactech126

Thermostat make and model? Equipment make and models? How is EVERYTHING wired right now?

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Bobwoodberry

Sorry I'm late getting back, work got int the way. I took the jumper off and thought I had it licked, it went 42 hours with no issues then it happened again. I'm at a loss? What do I do? By the way the t-stat is wired like this black-E, white-Aux, green-g, orange-o/b, brown-c, yellow-y,and the red to the r and rc ( has a factory jumper) Please help!
Bob

Bobwoodberry

The unit is a 10 year old Ruud model model # UBHC-17J11SFD. T-stat is a Honeywell Pro 5000 (TH5220D1003) Non programmable. Up to 2 heat / 1 cool.
I double and triple checked the relay wiring so I'm confident I didn't mess that up.

Bobwoodberry

Can a bad sequencer cause the heat strips to cut on at weird times with no fan just burning smell coming from registers?

hvactech126

turn the system to off and switch on the fan from thermostat. see if you can get it to act up. you may have to cycle it a few times to get it to act up. if it does act up then you will need to check voltage from G to C in air handler to verify that the AHU is receiving the fan signal.

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yuri

Not necessarily cut in but they will fail to shut off the element and sometimes shut off the fan which give U the burning smell and destroys the element.

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Bobwoodberry

I've tried it several times and nothing acting up. Most of the time the unit is satisfied and it just starts heating the strips for no reason, not even close to needing to warm up to satisfy. One time though it did run until it satisfied and then the heat strips continued heating with no fan.
Bob

Bobwoodberry

I have another post about my problem with a bunch of details, the heat strips cut on at weird times for no reason. New t-stat and fan relay but can't find what's causing problem.
Thanks,
Bob

yuri

What brand and type of tstat is it. some cheap units and others are "power stealing" to extend the battery life and can cause your problem.

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