Question about Ruud UAKA030 Air Conditioner

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The heat relay is closing on call for heat but opening quicly

The unit is new and the heat has never run before. It is a heat pump with 5kw heat strip.

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  • tomholman70 Feb 04, 2009

    House temp is 65, it warmed up after the heat pump ran so that part is working correctly, thermostat set at 74, Heat pump is operational, 2nd stage heat (5kw heat strips) relay comes on for 1 second, then off for approx 10 seconds. The relay is fed through a board mounted on the fan blade housing. The relay states it is 24vac input/24vdc output. Unit is 240vac 1ph 60.

  • Ken Bledsoe May 11, 2010

    The thermostat has a selection switch cool off heat emg heat where is your switch set at?

  • Ken Bledsoe May 11, 2010

    What is your thermostat set at is it heat or emergency heat?

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Ok rheem and ruud is the only co that the hp is set to the b term on the stat for heat. is the stat wired corectly? is it a hp stat? and on a 2 1/2 ton hp you should have more than 5 kw. what kind of stat? the relay is correct because you have transformer that takes 208/230 down to 24 va. let me know.

Posted on Feb 04, 2009

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Starter motor went out on 92 5.0 ho replaced it and new battery, now fuel pump does not work I get a 542 code checked fuel pump relay and inertia switch both good fuse good


  • Code 542 indicates one of the following conditions:

Engine Starts:

· Fuel Pump secondary circuit shorted to power

· Fuel pump relay contacts always closed

· Open in fuel pump monitor (FPM) circuit between ECU and connection to POWER TO PUMP circuit

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· faulty ECU

Engine Does Not Start:

· Open inertia switch or inertia switch circuit

· Open in or between ECU and fuel pump (This includes open in fuel pump brushes/windings)

· faulty ground connection at fuel pump

The easiest way to check this circuit is to go to the fuel pump relay. If the relay clicks when the key is turned to the "RUN" position, then the inertia switch circuit is ok.

The Pink/Black wire starts from the fuel pump relay and goes two directions. One side goes back to the fuel pump. The other side is the fuel pump monitor circuit and goes to pin #8 at the ECU. This wire should only be hot for a second or two when the ignition is turned to the RUN position.

The fuel pump relay receives power on the Black/yellow wire. It comes from a fusible link at the power distribution center. This wire should be hot at all times.

If all the above is working as designed, them you probably have a bad fuel pump.

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I have an Intertherm electric furnace an sometimes it won't start but if I shut off the Tstat then turn it back on the furnace runs fine for awhile thought that it was T stat then thought that it was...


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Electric strips have what's called a Sequencer also called a stack relay it's a relay that brings on the fan and strips at the same time on a call for heat. If you have more than 5kw you will have more than one Sequencer in fact you will have one for every 5kw.(only the first one will bring on the fan) It could be your high limit making your unit stop heating before it reaches the temp set on the T-stat. Check and see if your getting proper air flow across the electric strips your filter could be dirty. If not remove the cover from your T-stat and take the red and white wires off and twist them together this will bring on the heat then just watch the unit for about an hour if no problems then you have a bad T-stat. If the unit does cut off and the fan seems to be blowing fine you might have a bad high limit switch.

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I have a HVAC unit made by Inter-City Products. I


In general, when more than one heat strip is present, one is used as primary heat, and the second one comes on if the primary does not prevent the temp from falling.
Another set up is, yes there can be a time delay in the system. it usually takes a few minutes for the second set to energize.
Since you did not state if this is a heat pump, i'm limited in my response at this time.
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