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Heat pump turns on and off in the heat mode

My heat pump works fine in the A/C mode but in the heat mode it cycles on and off every 20 seconds what could be the possible problems. The filters are clean and it works fine in the A/C mode

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  • gntschorn Jan 17, 2009

    Are the coils you are speaking of on the outside unit, which are clean, or in the inside unit ?

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Check both coils. If they are dirty have them cleaned.

Posted on Jan 17, 2009

  • Perry Putnam
    Perry Putnam Jan 17, 2009

    Coils are inside and outside. Is it just the outdoor unit that short cycles or inside too? If it's just the outside it can be cycling off on low pressure but may not be because of low refrigerant charge. There may also be a restriction at the metering device which regulates the flow of refrigerant. Unfortunately you will only be able to check the coils. If they are clean you will need a Serv. Tech. to complete the diagnoses.

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Hi there I have a spaform oslo.The problem I got is that the filtration sequence is running all the time the jets are constantly on speed 1. The Tub is up to temp I have no fault codes. Thanks Justin


make sure correct time is set on unit, then double check to see if filter cycles were ever change, follow manul instructions attached.

Filter Cycles
On all systems, the pump and the ozone generator will run during
filtration. At the start of each filter cycle, the blower [if
fitted] will run for 30 seconds to
clean out the air channels. Pump 2 and pump 3 [if fitted] will run for 5 minutes.
There are two filter cycles per day. The start/finish times of
each cycle are programmable. To program, follow the steps under
the heading
How to set the
time & filter cycles
on page 9, ensuring that you press
"Mode/Prog" to advance to the next setting option.
The factory default filter cycles are as follows:
The first filter cycle is automatically activated at
8:00AM and operates the pump until 10:00AM. The '
F1'
indicator icon on the control touchpad will be lit
when filter cycle 1 is running.
The second filter cycle is automatically activated at 8:00 PM
(20:00) and operates the pump until 10:00 PM (22:00). The
'F2'
indicator icon will light when
filter cycle 2 is running.
http://thecoverguy.co.uk/wp-content/uploads/2015/05/Spaform_Owners_Manual.pdf

Jan 07, 2016 | Pool & Spa

1 Answer

Heat Pump makes a surging/buzzing sound every 20 seconds


You might have a short going to your reversing valve. Check the temperature of all three lines out of the valve. The one on the left should be cold and the one on the left should be warm hot. . Check voltage to the valve.if it fluctuates that might be the reason for the buzz.

Mar 04, 2015 | Heating & Cooling

1 Answer

Goodman gph1348m41ac unit is blowing cool air in heat mode with mid 30s ambient outdoor temp. I turn it off then on and will usually blow warm air but this cycle is becoming more repetitive. any expert...


A heat pump on the optimal heating day (about 50 degrees ambient) will only deliver approximately 85 degree air as compared to 125 degree air from a fossil fueled furnace. The colder the outdoor air is the less heat there is available to be transferred to the living space. At 30 degrees, the heat transfer capability is getting close to negligible meaning the run cycles will be approaching continuous and eventually as the heat pump along cannot maintain setpoint, the outdoor stat or stats will bring on auxilliary heat in the air handler.

If your ambient temp is below the 'balance point' of the heat pump, the house temp will drop a little lower and most times energize the heat strips through the outdoor t-stat. Your outdoor stat could be set too low for the heat pump to carry the structure all the way down to the balance point so when you turn it off and back on, the lower indoor temp automatically brings on the heat pump plus a heat strip or two, thus the warmer air. Second stage on the stat satisfies due to the heat strip, drops them out of the circuit and the heat pump is left running on first stage heat delivering the perceived cold air.

Your outdoor stat could also be not functioning correctly and not allowing the heaters to come on until the system is turned back on reestablishing the two stage call for heat.

Tons of possibilities and not enough room to list....

Jan 01, 2015 | Goodman Manufacturing Goodman GPH1348M41 4...

1 Answer

My Mistral MSS25 has stopped blowing hot air, it's only 6 degrees and it's friday afternoon before a long weekend! Is there anything I can do to fix it before someone can come out here next week to lo


No heat pump will put out much, if any at 6 degrees.
A heat pump is an air conditioner that reverses cycle via a reversing valve that re directs the refrigerant flow in the unit, in ac mode,
heat from indoors is rejected outdoors in the heat mode the heat from outdoors is rejected indoors.
The system does this by evaporating and condensing refrigerant.
For the refrigerant to be "boiled" or "change state" from a liquid to a vapor a temperature differential must exist, meaning the heat from the outdoor air must "boil" the liquid refrigerant.
For this to be possible the liquid refrigerant must be colder than the 6 degrees ambient or it will not boil anything.
For a refrigerant used for AC to be that cold the pressure will be in a vacuum for most refrigerants temperature pressure relationship.
Heat pumps below 40 degrees ambient outdoor temperature are
not effective, at this temperature outside drops a degree lower it further degrades the heat output .Power companies that finance Heat pumps typically will install an outdoor thermostat to prohibit the 2nd stage or electric heat strips from coming on until it is 40 or below outdoors, at a certain point well before 6 degrees a heat pump should be ran on the emergency heat mode which is the heat strips and the fan. Since 1500 Watt electric heaters are available at Wal-Mart for $20 the best alternative in this situation would be to buy a few of them.

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Jun 06, 2014 | Heating & Cooling

1 Answer

Heat pump compressor wont come on in heat mode, works fine in cool mode, we get heat occaisionally for about 2 min, then the compressor shuts off. it is a fridgedaire window unit.


Try setting the thermostat at a normal heat setting. By raising the temperature too high the unit thinks that the heat pump won't be effective and go into strip heat mode.

Nov 17, 2013 | Frigidaire Energy Star Room Air...

1 Answer

Heat Pump Blowing Cold


Unless you just installed or had the thermostat installed recently, I would not point at the thermostat as the problem. With what you have described I would suggest have your units serviced as it sounds like a loss of charge, or failed defrost control board. The "Aux" comes on when the unit is using secondary heating (electric heat strips). That occurs when the demand temperature (what you set it to) in Heat mode is more than the current room temperature, usually ~2-4 degrees higher. Also happens in defrost mode. Defrost is a heat pump cycle that melts any build up of ice on the condenser unit (outside unit). That process is simply the unit running in cool mode which will heat up the outside unit to melt any ice. Defrost cycles vary with manufacture but usually you can tell if is in defrost by looking at the outside unit, during defrost the unit will be warm or hot sometimes there is steam and the compressor will be running but not the fan. Defrost only happens on heat pumps in "Heat" mode. Rheem has a 10 yr compressor and parts warranty, so call the installer or Rheem authorized service company.

Nov 11, 2013 | Honeywell RTH7600D Touchscreen 7-Day...

1 Answer

A downeast hot tub water is only 78 degrees turn up to 100 doesn't never get warmer and shows a ECn code


Check your filter cycles and switch spa into Standard Mode as you have it in Economy. (In Economy mode it will only heat during the filter cycles).
If the Ecn or Ec Message is Alternating with the Water Temperature on the Display, the Spa is Operating in the Economy Heating Mode.

If the Ecn or Ec Message is ON Solid (Not Flashing) on the Display, the Spa is Operating in the Economy Heating Mode, but there is No current water temperature because the Spa is between Filter Cycles.

Ecn or Ec is Alternating with Temp:
The Spa is Operating in the "Economy" (Ecn or Ec) Heating Mode.

The Water Temperature is Sampled Only during Programmed Filter Cycles. The Heater will Only operate and Heat up to Set Temperature during the Filter Cycles. The Water Temperature will probably drop Below Set Temperature between Filter Cycles. Other Heating Modes are Standard, Standard in Economy, and Sleep Modes.

Ecn or Ec is ON Solid (Not Flashing):
The Current Water Temperature is "Unknown" (- - - or - -) while in Economy or Sleep Mode.

Between Filter Cycles, while in the Economy or Sleep Heating Modes, the Pump has not turned ON and the Last Water Temperature is not Current. To read the Current Water Temperature, either Change to Standard Heating Mode or turn On the Heating Related Pump, and wait at least 2 Minutes.

Apr 06, 2013 | Washing Machines

1 Answer

On my hot tub control panel Balboa M1 is the code Ec?


Your spa is in Economy Mode:
Ecn or Ec MessageEcn or Ec Message

If the Ecn or Ec Message is Alternating with the Water Temperature on the Display, the Spa is Operating in the Economy Heating Mode.

If the Ecn or Ec Message is ON Solid (Not Flashing) on the Display, the Spa is Operating in the Economy Heating Mode, but there is No current water temperature because the Spa is between Filter Cycles.

Ecn or Ec is Alternating with Temp:
The Spa is Operating in the "Economy" (Ecn or Ec) Heating Mode.

The Water Temperature is Sampled Only during Programmed Filter Cycles. The Heater will Only operate and Heat up to Set Temperature during the Filter Cycles. The Water Temperature will probably drop Below Set Temperature between Filter Cycles. Other Heating Modes are Standard, Standard in Economy, and Sleep Modes.

Ecn or Ec is ON Solid (Not Flashing):
The Current Water Temperature is "Unknown" (- - - or - -) while in Economy or Sleep Mode.

Between Filter Cycles, while in the Economy or Sleep Heating Modes, the Pump has not turned ON and the Last Water Temperature is not Current. To read the Current Water Temperature, either Change to Standard Heating Mode or turn On the Heating Related Pump, and wait at least 2 Minutes.

Mar 13, 2013 | Balboa Instruments Pool & Spa

1 Answer

Hot tub in EC with light flashing


Ecn or Ec Message
Ecn or Ec Message

If the Ecn or Ec Message is Alternating with the Water Temperature on the Display, the Spa is Operating in the Economy Heating Mode.

If the Ecn or Ec Message is ON Solid (Not Flashing) on the Display, the Spa is Operating in the Economy Heating Mode, but there is No current water temperature because the Spa is between Filter Cycles.

Ecn or Ec is Alternating with Temp:
The Spa is Operating in the "Economy" (Ecn or Ec) Heating Mode.

The Water Temperature is Sampled Only during Programmed Filter Cycles. The Heater will Only operate and Heat up to Set Temperature during the Filter Cycles. The Water Temperature will probably drop Below Set Temperature between Filter Cycles. Other Heating Modes are Standard, Standard in Economy, and Sleep Modes.

Ecn or Ec is ON Solid (Not Flashing):
The Current Water Temperature is "Unknown" (- - - or - -) while in Economy or Sleep Mode.

Between Filter Cycles, while in the Economy or Sleep Heating Modes, the Pump has not turned ON and the Last Water Temperature is not Current. To read the Current Water Temperature, either Change to Standard Heating Mode or turn On the Heating Related Pump, and wait at least 2 Minutes.

Dec 23, 2012 | Jacuzzi Balboa R574 System for 1 2 Speed...

3 Answers

I have a 1993 tioga motorhome with a ford 460 engine. Last summer in the heat I drove for about 1.5 hours before it just died. I sat for about 20 minutes it started up and ran fine for another hour and a...


I'd be tempted to have fuel pressure checked, if at all possible, when it quits. If nothing else, carry a can of quickstart with you, and when it quits, remove air intake at throttle body inlet, and open throttle plate and give a good squirt of quick start, then try to start it. If it starts for a second or 2, then you know you have spark, but no fuel. I've seen fuel pumps work good while cool, and cut -out when it gets hot. Then sit and let pump cool off for 20 minutes or so, then pump up to pressure again and away we go, until it gets hot again. You might also find if you park in the shade, you'll get further, or even on a full tank. Another good idea would be to change fuel filter in case fuel pump is working too hard pushing fuel through a plugged filter, and causing low fuel pressure.

Mar 30, 2010 | 1993 Ford Econoline

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