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Heat pump does not turn on aux gas when required.

I have a Rheem ''RQPW-B024JK06E BVA'' Heat Pump.
When the outside temp goes below 15F (-10C) the heat pump is not supplying enough heat to warm the interior of the house above 60F (15C) and the aux gas heat is not turning on. Thermostat set to ''Auto''.
The heat pump works continually trying to maintain 68F (20C) but the heat registers are only supplying about 64F (18C).
When Iset the ''(-)HC-TST402DFMS'' thermostat to ''EMERG''ency the heat pump compressor shuts down & the gas now supplies heat to the interior to whatever temp I want (to me this indicates the Gas heater & Gas valve are working OK). What could be causing the unit not to turn on the gas to maintain the req'd temp when in the Auto mode? The unit is only 2 years old & this is the first winter it has been used.

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Posted on Jan 02, 2017

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SOURCE: Heater running continuously

Sounds like you have a problem with your heat pump. Your aux heat is a electric coil. how old is the unit when was the last time it was serviced? How cold is it out side?

Posted on Jan 16, 2009

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SOURCE: rheem heat pump. blower will not turn off

The fans are set to delay for 60-90 seconds to remove all heat from the heat exchanger/heater elements.

If the fan runs any longer than 3-4 minutes after the Emergency Heat shuts off, you may have a bad sequencing relay in the air handler.

Posted on Jan 27, 2009

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SOURCE: janitrol furnace wont ignite

it is probably a bad hot surface ignitor

Posted on Feb 21, 2009

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SOURCE: space heater is turning off circuit breaker

This sounds like an overload. Space heaters can pull as much as 15 amps on thier own. Some cord heating is normal, but if it gets hot, its overloaded. If it's old as you indicate, your circuits perhaps can't take the extra loading.

Also, never use an extension cord with a space heater.

Posted on Dec 07, 2009

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SOURCE: I have the following home

If your furnace has a filter or fan compartment door, be sure it closed tightly and that the filter is installed correctly - there could be an interlock switch that is preventing the thermostat from operating. Also, if you haven't already turned off the power to the furnace, do that, wait a minute and then turn it back on.

Obviously, make sure the thermostat is on, is set to heat and calling.

Posted on Dec 12, 2009

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Heater, ac and fan speeds all working fine. Compressor not kicking in...just auxiliary heat working.


Outside temp too low, so outside thermostat and it's settings will not allow the heat pump to work. But insist on the ausilary heat to work instead. Heat pumps usually do not produce enough heat when below 40F outside temp. If you have Gas heat, it may be more economical than the heat pump below 40F. If electric auxilarry heat, it may compete at 32F. Talk to your dealer, installer, or manufacture.

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Hey, I purchased your Honeywell RTH2510 Thermostat, but I didn't even think to label the wires when I took the old thermostat off. Upon installation of the new Thermostat (2510) the Air Conditioning...


The connections that you really need to reference would be at the air handler itself. That would tell you which wires go outside to the heat pump and which wires go to the air handler. I can however give you some basics that may help.

Heat Pump Wiring
Terminals/Colors/Function
R- Red- 24v power supply. (Usually a jumper between RC/RH)
G- Green- Fan
W- White- Heat (Sometimes W1-W2, first or second stage heat)
Y- Yellow- Cooling (Same applies as above i.e. Y1-Y2)
C- Common (Most people use blue unless it is used for B terminal and sometimes cooling on older 4 wire systems.
B/O- Reversing Valve for heat pump. Either powered heating or powered cooling, depending on system installed.
Aux- Also used for heat.

Note: Considering that the installer had their own way to run all wires, use different wires, connections, etc. This is just a reference to common wiring in the field.

How the most common system is hooked up:
Thermostat:
Red wire goes to R terminal
Yellow wire goes to Y1 or Y2 terminal
Green wire goes to G terminal
White wire usually goes to W1 or W2 terminal
Orange or Black wire goes to B/O terminal
Brown wire usually goes to Aux terminal
Blue wire goes to C terminal, unless its being used as stated above.

This is without using a fossil fuel kit or zone control board.

Where do they go from the thermostat?
Red
goes to the air handler transformer or board and goes outside to heat pump to power low voltage controls.
Yellow wire goes straight outside to Y terminals on heat pump unless going to a board inside first.
Green goes to the air handler fan relay.
Common goes to the air handler and outside to heat pump.
Black or Orange will go outside to heat pump terminals for reversing valve.
White usually goes outside to heat pump,and inside to air handler. Will explain reason further down.
Brown will go to the air handler to the heat relay for the emergency heat.

On a call for heat, with a powered cooling system (more common).
The R, Y, and G terminals energize, sending a signal to start the blower and pull in the contactor outside. Note that the Y terminal is usually cooling, but since this is a powered cooling system, the reversing valve is not energized, causing the system to run in heat mode. If you have powered heating, the reversing valve terminal will energize also. Depending on thermostat, if you set the temp substantially higher than room temp, it may kick on the emergency/aux heat to quickly raise the room temp. On a call for emergency/aux heat, the R, G, and E/Aux terminals are energized, turning on the electric/gas heat instead of the heat pump. This comes in handy since the heat pump can only pull so much heat from outside before its not enough to properly warm the house, usually around 30 degrees outside temp. If you are running the heat pump and the system goes into "defrost", the outside unit will send a signal back to the air handler, through the white wire I mentioned earlier, to tell the emergency/aux heat to come on while it is in defrost mode, providing heat whenever needed.

Again, this is just a reference guide to some basic wiring, but hopefully it will tell you where the problem is or at the least, give you a good start. There are variables in which things can change the wiring like a zoning system or fossil fuel kit. Even then, you should be able to get pretty close. Hope this helps and Happy Holidays!

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1 Answer

Aux keeps coming on on regular heat is there something wrong with heat


See if it happens only when your temperature of the room is more than 3 degrees of your setpoint temperature. Since you have a heat pump, the auxiliary (electric heat strips) is use for backup of the heat pump when it can't keep up. The heat pump will run by itself if it can maintain temperature within a couple degrees. If it is too cold outside to handle the load or you set the temperature more than 2 degrees past room temperature, the auxiliary will turn on. The thermostat has a memory of how long it takes to reach desired temperature. If it goes into auxiliary mode trying to satisfy setpoint during the last call for heat, it will start the next call for heat in both aux & heat pump mode until the thermostats algorithm (timed program) allows only the heat pump to run. Not sure if you have an air to air, or geothermal heat pump. The outside air temperature will affect only the air to air system ie. when the temps drop outside, the heat coming out of your vents will be cooler...the air to air systems drops efficiency when the outdoor air drops.

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I have a Rheem A/C Heat Pump split with gas backup. The gas unit is mounted in the air flow directly before the A/C HP coil. Should the gas unit be wired as stage two heat, or is it OK to wire it as just...


Stage 2 is okay as long as there is a fossil-fuel kit accessory wired in the field control wiring. EM heat would only allow gas furnace operation if the thermostat is set for EMER HT mode.......this is not ideal and not recommended. Dual-Fuel applications require a fossil fuel kit.
I'm including a link with information on one type of fossil fuel kit. It explains how it works. If you have limited HVAC service knowledge and/or experience, I recommend having an experienced service technician check your system operation in all modes to ensure proper operation for longer system life at peak operating efficiency.
http://www.ntsupply.com/files/products/ffk100operation.pdf

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1 Answer

Aux heat always comes on in heating (Ruud heat pump)


what type of system is it, if it's it Rheem the o/b needs to be set for B, if not check the freon charge, or thermostat, there will be a point where the aux. heat comes on when you turn it up, poss. only 4 degrees, is it a mercury stat or digital ?

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Temp set at 68 degrees but goes to 66 and the heat pump never shuts down has an electric aux


Depending on the outside temp. your heat pump might not keep up with the demand. It is not economical to run your heat pump in temperatures at or below freezing. Doing so could cause compressor failure and these are not cheap to replace. I would be running the aux. electric in low temps.

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Hello, I have a 1.5 ton rudd ac/heat pump


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Carrier heat pump: aux heat does not seem to work


The unit is probably to small for theare you are trying to heat.

When the Aux HT light came on that meant the heat pump could not keep up with the demand for heat. (Probably due to extreme cold, or undersized unit.)

If yu have heat, then at least one heat strip is operating. If you have multiple heatstrips, one or more could be malfuncioning.

Or it could simpy be to cold/to small fr your area and not able to keep up.

How many square foot are you trying to heat?
What is the outside temp?
What is the inside temp?
What size unit (BTU output) do you have?

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