A meaningful share of the heat pump calls we take turn out to be normal behaviour that nobody explained at installation. We would rather tell you that on the phone than charge you for the visit. When it is a genuine fault, the expensive one to leave alone is auxiliary heat running when it should not be.
Napps HVAC — Longview & East Texas since 1957
A heat pump has failure modes an air conditioner does not, because it has to run backwards half the year. These are the ones we see.
The costliest fault to ignore. Resistance strips engaging when the heat pump should be coping, usually pointing at charge, defrost or thermostat programming.
Ice on the outdoor coil that never clears, or defrost running almost continuously. Both damage the system and both waste substantial energy.
The component that lets one machine heat and cool. When it sticks you get the wrong season — cooling on a heat call, or heating in July.
Low charge reduces heating capacity sharply, so the system leans on auxiliary heat. Refrigerant is not consumed — low means a leak, which is what we look for.
Capacitors, contactors and control boards. Intermittent faults that come and go with temperature are very often loose or corroded connections.
A heat pump moves a large volume of gently warm air, so it is more sensitive to restricted airflow than a furnace. Filters and ducts matter more here.
Four things that alarm people and are entirely normal, and the versions of each that are not.
Normal. Heat pump supply air is around 90 to 100 degrees — warmer than the room but cooler than your hand, so it feels cool while heating the house perfectly well. Not normal: sustained genuinely cold air while the thermostat is calling for heat, which suggests the system is stuck in cooling mode or has lost refrigerant capacity.
How Heat Pumps Work →Normal. In cold damp weather frost builds on the outdoor coil and the system periodically reverses for a few minutes to melt it, producing steam that looks alarming and is not. Not normal: ice that never clears between cycles, ice encasing the whole unit, or defrost engaging almost continuously. Those are defrost control faults and they damage the coil over time.
Heat Pump Services →Normal. Heat pumps are designed to run long, steady cycles rather than short powerful bursts — that is where their efficiency comes from, and a correctly sized one will run much of a cold day. Not normal: running continuously while never reaching setpoint, or running with auxiliary heat engaged the entire time.
Heat Pump Installation →Normal occasionally — during a hard freeze, or briefly during a large morning recovery. Not normal: engaging most of the time, or showing on the thermostat through mild weather. That is the fault worth calling about, because those strips cost several times what the heat pump does to run and the underlying cause is usually inexpensive to correct.
Heat Pump Services →The distinction that saves a call-out.
| What You See | Normal | Becomes a Fault When |
|---|---|---|
| Cool-feeling supply air | Yes | It is genuinely cold and stays that way |
| Steam from outdoor unit | Yes | Defrost runs almost continuously |
| Frost on outdoor coil | Yes | It never clears between cycles |
| Long run times | Yes | It never reaches the setpoint |
| Auxiliary heat occasionally | Yes | It runs in mild weather or constantly |
Or call 903-758-6482 — 24/7
Both modes tested, auxiliary heat behaviour checked, and normal behaviour explained rather than billed for.
Whether the thermostat shows auxiliary or emergency heat tells us a great deal before we open anything.
One machine, two modes. We verify both, because a reversing valve fault only shows in one of them.
The three things that most often push a heat pump onto expensive auxiliary heat, checked as a matter of course.
You approve a figure first, and we explain what was wrong and what it was costing you to run.
These are the ones that are not normal heat pump behaviour.
Both seasons understood as one system, and honesty about what is actually broken.
Or call 903-758-6482 — available 24/7
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What people ask when a heat pump seems to be misbehaving.
Long cycles are normal and are exactly how a heat pump achieves its efficiency — a correctly sized one will run much of a cold day rather than switching on and off. The problem is running constantly while never reaching the setpoint, or running with auxiliary heat engaged the whole time. Those point at refrigerant charge, airflow restriction or a system undersized for the house.
Some frost on the outdoor coil in cold damp weather is expected, and the defrost cycle clears it periodically — that is the brief reversal that makes the unit steam. What is not expected is ice that persists between cycles or builds until the unit is encased. That is a defrost control, sensor or board fault, and left alone it damages the coil and eventually threatens the compressor.
It depends heavily on the component. Capacitors, contactors, defrost sensors and thermostat issues are at the inexpensive end. Refrigerant leak repair sits in the middle, since finding the leak is most of the work. Reversing valves and compressors are major repairs, and on an older system we would talk through whether replacement makes better sense. We diagnose first and quote flat before doing anything.
Occasionally during a hard freeze, no. Frequently, or in mild weather, yes — that is a fault worth acting on. Auxiliary heat is electric resistance heating that costs several times what the heat pump does to run, and in this climate it should be a rare backstop rather than a regular participant. The usual causes are low refrigerant, a defrost fault or thermostat set-backs demanding large recoveries.
Yes — in summer a heat pump is simply an air conditioner, and all our cooling diagnostics apply. In fact a summer repair visit is a good opportunity to test heating mode too, which is how reversing valve problems get caught in July rather than discovered on the first cold night in November.
It depends on the repair and the age. Under about ten years, most repairs are worth making. Past twelve to fifteen, a major repair such as a compressor or reversing valve usually costs enough that replacement is the better decision, particularly given how much more efficient current equipment is. We will give you the honest comparison rather than the one that sells more.
Heat pump basics, installation and the cooling side each have their own page.
We will tell you on the phone if it is normal behaviour — and diagnose it properly if it is not.
Tell us what the system is doing and what the thermostat is showing. Mentioning auxiliary or emergency heat indicators helps a great deal.
