Pool heat pump diagnostics and troubleshooting

What we handle

Heat pumps that will not heat, that heat far more slowly than they used to, that show a fault, or that have started making a noise. The visit is a diagnostic: it establishes what has failed and what putting it right involves, and anything beyond that is quoted afterwards.

Why this page is separate from the heater page

A gas heater burns fuel and produces heat quickly. A heat pump runs a refrigeration cycle backwards to extract heat from outside air and put it into your water. Same job, entirely different machine.

That difference decides what "broken" even means:

• A heat pump is slow on purpose. Warming a pool takes hours, not minutes. That is normal.
• Its output falls as air temperature falls. Below roughly the middle of the day in a cold week it may produce very little, and nothing is wrong.
• It needs airflow. A unit boxed in by a wall, a hedge or stored equipment is recycling its own cold exhaust and cannot work.

A real share of heat-pump calls turn out to be the first two behaving correctly. We would rather establish that on the phone than charge you to be told it.

Problems we see

• Not heating at all. Compressor not running, refrigerant loss, or a control fault stopping it before it starts.
• Heating far too slowly. Sometimes airflow, sometimes refrigerant, sometimes the weather doing exactly what it does.
• Icing on the coil. Beyond normal frost, this points at refrigerant, airflow, or defrost control.
• Faults on the display. These name a subsystem — pressure, temperature, flow — rather than a part.
• Noise or vibration. Fan, compressor and cabinet each sound different, and that usually narrows it to one assembly before anything is opened.

Repair or replace

Fans, capacitors, contactors, sensors and control boards are ordinary repairs on a unit worth keeping.

Refrigerant circuit failures are the harder case. A leak has to be found and repaired, not just topped up — a unit that lost its charge once will lose it again — and on an older unit that work can approach the cost of replacing it. Compressor failure usually settles the question by itself.

We will tell you which of those you have before you spend anything on it.

Equipment we work on

Pool heat pumps from the manufacturers common here, including Pentair, Jandy and Hayward.

The visit establishes what has failed and what putting it right involves, and you get that before any work is agreed.

What you can safely check

• Clearance. Is anything within a few feet of the intake or the fan discharge? Move it and see.
• The coil. Look for dirt, cottonwood, or landscaping debris packed into the fins.
• The air temperature when you noticed the problem, and what the pool gained overnight if you know. This is the single most useful thing you can tell us.
• Whether the pump is running. A heat pump needs flow, same as a gas heater.
• The fault code, photographed as displayed.

When to stop

Stop before you open the cabinet. Behind the panel is a compressor circuit under pressure and capacitors that hold a charge after the power is off. Neither forgives a mistake, and neither is diagnosable by looking.

If the coil is packed solid with ice, switch the unit off and leave it. Running it in that state is how a refrigerant problem becomes a compressor problem.

What a visit looks like

We check the easy physical causes first — airflow, clearance, coil condition, flow through the unit — because they are common and cost nothing to rule out. Then we read the unit's own fault history and watch it run, measuring what it is actually doing against what the conditions should allow.

If the answer is that it is working correctly for the weather, that is what we will tell you.