When to call a heat pump technician

What does a heat pump technician do?

A heat pump technician is a trained, licensed tradesperson who diagnoses, services and repairs heat pump systems. The work includes checking refrigerant pressures and charge, testing electrical components such as the compressor, fan motors and control board, cleaning coils, measuring airflow and confirming that the defrost cycle and backup heat work. In Canada, handling refrigerant requires certification, and licensing for refrigeration, gas or electrical work depends on the province, so it is fair to ask for credentials. A technician will also advise on maintenance and on when it makes more sense to replace a worn-out unit than to repair it.

The role differs from an installer in emphasis, although many companies send the same person for both. Our guide on how to choose an HVAC contractor covers licences and insurance.

What can you check before calling?

Many service calls turn out to be simple. Try these first, and switch off the power if anything looks unsafe.

• Thermostat or remote. Confirm the mode, the temperature settings and the batteries.
• Breakers and disconnect. A tripped breaker or open outdoor disconnect stops the unit. Reset a breaker once only. If it trips again, leave it off and call.
• Filters and vents. Dirty air filters and closed registers choke airflow. See heat pump cleaning.
• Snow and debris. Clear anything blocking the outdoor unit, and look at the drain path.

Frost on the outdoor coil that clears itself is normal, as described in defrost cycles and noise.

Which signs mean you need heat pump repair?

• No heating or cooling after the basic checks, or a system running constantly without reaching the set temperature.
• Ice that stays on the outdoor unit for hours, or a block of ice around the base.
• Unusual noises such as grinding, squealing, banging or a new loud hum, which can mean a faulty motor or fan.
• A burning or electrical smell, which calls for switching off at the breaker straight away.
• A breaker that trips repeatedly.
• Water leaking inside, or an oily residue near refrigerant lines.
• Short cycling, weak airflow, error codes or a bill that rises without a clear reason.

Do not open sealed parts yourself. A leaking system needs a technician to find and fix the leak, rather than only topping up refrigerant. Early attention to issues like these protects efficiency, keeps energy bills and energy costs down and can prevent larger repair bills. A heat pump works year round, so a breakdown can come in summer as well as in winter.

What if it fails in winter?

Use backup heat if you have it, such as electric elements, a furnace or baseboards, and keep the house warm enough to protect pipes. Our winter heating emergency guide covers staying safe while you wait. Ask the company about response times when you book, since a no-heat call in a cold snap may take longer than usual.

What should the visit include?

Expect a diagnosis, an explanation in plain language, a written estimate for repairs and a note of what was tested. Ask whether the diagnostic fee is credited toward the repair, whether parts and labour carry warranties and whether the fault might be covered by the manufacturer warranty. Keep records, since they help with future service. A good visit also leaves you with advice on preventive heat pump maintenance, as in the maintenance checklist.

For routine yearly heat pump servicing, see what a service visit covers, and for judging a service plan, whether an HVAC service contract is worth it. If the repair quote is large and the system is old, the repair or replace decision guide helps.

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