Key takeaways
- When your heat pump refuses to start, it's easy to assume the worst. Fortunately, many problems have simple causes that can be checked safely before arranging a service.
- If the unit still won't operate after these basic checks, professional diagnosis is the safest option.
- Ensure the heat pump has power.
When your heat pump refuses to start, it's easy to assume the worst. Fortunately, many problems have simple causes that can be checked safely before arranging a service.
If the unit still won't operate after these basic checks, professional diagnosis is the safest option.
Check the Power Supply
Ensure the heat pump has power.
Look for:
- A tripped circuit breaker.
- An isolation switch that has been turned off.
- A recent power outage.
- Error lights on the indoor unit.
If a breaker repeatedly trips, don't continue resetting it. This may indicate an electrical fault.
Check the Remote
Flat batteries are a surprisingly common cause of service calls.
Replace both batteries and confirm the remote is set to the correct operating mode.
Has a Timer Been Activated?
Many remotes include timers or scheduling functions.
A timer may prevent the unit from starting immediately, even though nothing is actually wrong.
Look for Error Codes
Many modern heat pumps display a flashing light or error code when a fault is detected.
Make a note of any code before turning the power off, as it may help identify the problem.
Could It Be Protecting Itself?
Some systems include built-in delays after a power interruption or when switching between heating and cooling.
Waiting a few minutes may allow the unit to restart normally.
When Should You Call Holmes Services?
Book a service if:
- The unit has power but won't start.
- Breakers continue tripping.
- Error codes appear.
- The outdoor unit never runs.
- The problem returns after restarting.
Attempting electrical or refrigeration repairs yourself can cause further damage and may be unsafe.
Frequently asked questions
Should I reset the breaker?
You can reset it once if it has tripped unexpectedly. If it trips again, stop using the system and arrange professional inspection.
Can flat batteries stop the heat pump working?
Yes. Weak batteries are one of the most common reasons a heat pump appears not to respond.
Is there a reset button?
Most residential heat pumps do not have a simple reset button. Restarting the power supply may clear some temporary faults, but recurring problems require servicing.
Need practical advice for your system?
Holmes Services helps Auckland homeowners and businesses with heat pumps, ventilation, refrigeration and indoor comfort issues.