Question about Ruud UBHC Air Conditioner

1 Answer

Ruud Electric Furnace Cannot Reach Setpoint - "Watt Restrictor"?

The Watt Restrictor in my Rheem 11kW Electric Furnace (RBHC-14J11SFA) is shutting off 2 out 3 heating elements, meaning the room I am trying to heat never reaches its setpoint.

Consequently, the furnace fan and a single heating element runs continuously, never reaching the setpoint.

Each morning, the room is around 56F, the setpoint is 65F. It takes 90min to reach 61F, and it does not get any warmer. Assume the outside temp is around 15-20F.

I used a current clamp to verify only one heating element is energized MOST of the time; however, the other two elements do turn on for short periods before turning of again.

Is there any way to safely disable/override the Watt Restrictor? I want to prove that the three heating elements can achieve the desired temperature rise.

Note: I have a Lux single-stage thermostat. Wiring of the thermostat matches the recommendation on the furnace's wiring diagram.

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 3 Answers

Unfamiliar with watt restrictors.
heat strips have 2 safety devices, a thermal overload, they get to hot they shut off, cause not enough air flow increase fan speed this device is auto reset. a fusible link a fail safe to thermal over load, no reset and sometimes replaceable. if this does not help would like to ask you a few questions. one of the buildings i take care of has 200 + reem/ ruuds all electric heat. if a part is defective replace, please do not by pass. safety frist.

Posted on Mar 07, 2009

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

My system uses a permenant air filter. It's missing. It's a Ruud Model UBHC-14J11SFA. What size replacement filter can I put in this system?

You can measure what size and use any after market permanent filter. Measure the opening to the rear and across the opening. Should read as ?x?

Dec 03, 2014 | Ruud Air Conditioners

1 Answer

Is it ok to close vents in winter

Only a few...the furnace is rated @ a certain design static pressure, and when you close the could overheat the furnace, short cycling, etc.

Nov 24, 2013 | Ruud Rheem Weather King Furnace Fan...

2 Answers

Ruud furnace troubleshooting

check that elements are intact and getting voltage

Nov 14, 2013 | Air Conditioners

1 Answer

How to hookup Auxiliary heat (and/or use an extra wire at the thermostat)

They don't always use the correct wire colors,if it is labeled w it is for your strip heat,shouldn't hurt to hook it up,most likely they used it for the strip heat,most heat pumps are wired to turn on your strip heat when the heatpump is in defrost mode and it is controlled by the heat pump,you can hook this to the emerg. heat or w2 :)

Mar 08, 2013 | Ruud Air Conditioners

1 Answer

What is the blink code for Ruud 2 stage ac/furnace

on the board itself or on the schematic there is a legend that will tell you what the blinks mean. start there. its just a diagram that gives you the fault according to the number of blinks

Sep 29, 2012 | Ruud Air Conditioners

1 Answer

How old is a ruud furnace model number ugaa- 08KC, ser. number RN3D104F18794988

Hello, The model number for Ruud/Rheem equipment is located in the 12-13 digits, these appears to be a 1994. I have seen some furnaces with an age older than when the home was built (a 1995 furnace in a home built in 2000), so good job checking the serial number. This gives you the age it was manufactured.
Hope this helps James

Apr 03, 2011 | Air Conditioners

2 Answers

Ruud UBHC-21J18SFA blowing only "luke warm" air at best

That's crazy, we're having the same problem.  Turns out there was a wattage restrictor in the furnace that was switching off 3 of the 5 heating elements in an attempt to save energy.  Basically, the restrictor was sensing that the incoming air was warm, so only 2 of the 5 coils should be needed to heat the air.  Well that wasn't enough and we just sat with the furnace running all day long struggling to reach the 70 degree setpoint. 
This is something a technician can diagnose in a few minutes, but not the sort of thing a DIY'er should really handle.

Dec 22, 2008 | Ruud UBHC Air Conditioner

1 Answer

Cannot reach the temperature setpoint in heating sequence

I think what you are trying to ask is should you use a 2 stage thermostat or stick with a single and just double the stages on a relay to work at the same time. As long as the relay can handle the amp load, there is no real need for a 2 stage heat system, unless you are concerned by the efficiency of $$. If I am missing the question please reply.

Dec 11, 2007 | Ruud UBHC Air Conditioner

Not finding what you are looking for?
Ruud UBHC Air Conditioner Logo

1,201 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ruud Air Conditioners Experts

Lawrence Oravetz

Level 3 Expert

7686 Answers


Level 2 Expert

188 Answers


Level 3 Expert

347 Answers

Are you a Ruud Air Conditioner Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides