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Ruud heating unit not working. Currently operating on emergency but the temp is not coming up.

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Take the thermostat cover off and check to see if there is a jumper wiire between the e terminal and the w2 terminal. There should be a wire on the w2 terminal that is hooked up to the air handler to bring on electric heat if the heat pump does not work.

Posted on Dec 21, 2008

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Unit set to heat but outside unit fan won't turn on. Outside temp is below freezing. The weird thing is that you unit is putting out heat and not set to emergency heat


If it is a heatpump, the outside unit should not turn on below 35degrees or so. Below that temperature, the unit cannot effeciently exchange heat. When the outside temperature is low, the system automatically switches over to auxillary heat which uses the same heating elements as emergency heat.

Jan 11, 2011 | Ruud Air Conditioners

1 Answer

Our outdoor condensing unit (ruud upmc030jaz) runs continuously when outdoor temps in the 30's or 40's. never seems to catch up. I had a tech. check system and he said it was working fine. We're trying to...


Don't know if unit is big enough without doing a manual j. But if house is well insulated and double pane windows it should be. You air handler should have heat strips in it for aux heat. If not then you should have some put in probably 10k. You can use emerg. heat but will run bill up. Need to have Freon checked in unit.

Dec 19, 2010 | Air Conditioners

1 Answer

New heat pump system freezing, questioning wiring.


W1 and E on stat need tied together. When W1 comes on wire where all heat elements come on. On the outside unit defrost board set the 45-60-90 to 45 and see if that takes care of the frost problem.

Jan 03, 2010 | Air Conditioners

3 Answers

EM HEAT.... does it stand for ECONOMY HEAT or EMERGENCY HEAT? They both conflict. Someone's misinformed.


It stands for Emergency Heat. (Back up heat) . Normally you will find it on heat pumps. It's used manually when the compressor goes out on a heat pump. It's used automatically by the unit when it's so cold outside the heat pump can't keep up. This happens when there is not enough heat in the air to draw heat from. This happens at around 23 degrees. I hope this explains what emergency heat is and what it's used for.

Oct 16, 2009 | Ruud Central System Air Conditioner

5 Answers

What's the difference between EM HEAT and AUX HEAT?


Sorry, neither of these answers are completely correct.
You have a heat pump (or the wrong thermostat). Let's assume you have a heat pump.

In air conditioning mode, it works like every air conditioner you have ever had, but...

In heat mode, it reverses its operation. Have you ever felt the air coming out of the outdoor unit of your A/C unit? It's hot, isn't it. And the air coming out of the indoor unit (out of the registers) is cold. Now for a heat pump to produce heat it simply runs the air conditioner in reverse and the heat comes out in the house and the cold is released outside. Neat, huh!

Here's the problem with heat pumps...when it is really cold outside the heat pump can't produce enough heat to heat your home. So it has an additional heat source called "Auxiliary Heat". This heat comes on automatically when the house doesn't get warm enough. The source of this heat is based on the region of the country you are in. North/Northeast generally have oil heat, other regions have gas, and still others have to use electricity to heat. In Texas, we usually use electricity as the supplementary heat on heat pumps. VERY EXPENSIVE!

Now the "Emergency Heat"...this is exactly as stated in Solution #2. This is manually turned on by YOU at the thermostat when your heat pump fails. This turns on the auxilliary heaters and turns off the heat pump (remember, the reverse air conditioner). Again, this can be quite expensive to run if your heat source uses electricity! Gas and oil may be cheaper. The emergency heat is only designed (normally) to keep the house livable (not comfortable) until the Heating Tech can get out to you and fix your heat pump.

Something else you should know. It is normal for a heat pump's outdoor coil to frost up during heating mode. It will detect this and go into DEFROST mode and melt the frost off the coil. While it is doing this, it will turn on the auxilliary heater to keep the air blowing in the house at a reasonable "warm" temperature, but it will not be as hot as normal. In fact, heat pumps produce a lower temperature heat than traditional heaters. So the air may feel cooler during heating than you are use to anyway. This is normal and is not a sign of a problem.

So what do you do: Set your thermostat to the temperature you want and set the controls for HEAT/COOL and FAN-AUTO/ON and leave the EMERG HEAT off unless your heat pump breaks.

As always, keep your filters clean and your outdoor unit's coils clean and free of debris.

Hope this explains your question for you!

Oct 16, 2009 | Ruud Central System Air Conditioner

1 Answer

Ruud Heat Pump blows room temp on Heat and AC setting


A "Heat-Pump" is also known as a reverse cycle air conditioner, this means on heat the outdoor unit acts like the indoor section and vice versa. So in all probability you need to have it leak checked and recharged.

Apr 27, 2009 | Ruud UBHC Air Conditioner

2 Answers

Thermostat show AUX HEAT


A heatpump has two sources of heat. One is when the heatpump is operating in normal heat mode, and the other is typically electric heat strips.

The strips come on when the unit is going into defrost, when the unit is not able to keep up with the demand for heat (really cold temps) and when the unit is not working properly.

Whne the strips are on, the T-stat displays "aux-heat" to indicate the strips are in operation.

If the strips are working properly you should have warmer air than with the HP alone. Try switchin it from "heat" to "emergency heat" and see what it will do.

When the HP is not able to keep up with the demand for heat then the heat strips come on, but they typically come on only when the room temp has gotten well below the thermostat setting.

In that situation it would be normal to see indoor temps at 63 degrees when the T-stat is set on 70.

But when you set it to E-heat it bypasses the heatpump operation and goes directly to the heat strips. If they are working properly it should maintain an accurate temp in the home.

Jan 23, 2009 | GE Zoneline AZ55H09D Air Conditioner

1 Answer

My ruud unit will kick on and work for heat pump but when it tries to kick on for emergency heat it will not ignite. sometimes the ignitor will glow sometimes it wont


In order to diagnose your problem, you will need to set your therm on emergency heat only, watch the cycle in your furnace, and tell me what it does once it tries, and how many times it try's and what it does once it's tried and stopped?

Dec 06, 2008 | Ruud UBHC Air Conditioner

1 Answer

Ruud heat pump question


Does the air handler take a minute or two to start, this would be normal so that it doesn't blow cool air into the house before the unit is warmed up. If not could be the fan relay is weak and needs replacing. As far as the outside unit it sounds like you need to check the refrigerant. In cooling they are 70/150 psi. This should be checked in cooling mode, once you turn it to heating mode the pressures switch bring heat inside the house instead of out. I hope this helps.

Oct 23, 2008 | Ruud Air Conditioners

1 Answer

Janitrol Heat Pump


Jenny,

Sounds to be a system freon leak. The unit and the stat talk to each other and if the temp is not reached and the unit shut down in a set amount of time it turns on the E-heat. Now there are other facts that could be involved, plugged filters, dirty coils inside and out, etc. Check your filters first to eliminate that problem.

Apr 11, 2008 | Ruud UBHC Air Conditioner

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