Troubleshooting guide
Heat pump won't turn on? Here is what is happening and what to do.
A heat pump that won't turn on at all has either a power problem (breaker, disconnect), a control issue (thermostat or remote), a communication error between indoor and outdoor units (look for an error code on the unit display), or a failed component. Check the breaker first. Beyond that, you need a diagnostic visit.
Likely causes, ranked by probability
- 1
Tripped breaker or disconnect
Most common and easiest to check.
Likelihood 30%
- 2
Dead remote batteries
Mini-splits rely on remote for most controls.
Likelihood 25%
- 3
Communication error
Indoor and outdoor units can't talk to each other.
Likelihood 25%
- 4
Failed contactor or control board
Electrical component failure.
Likelihood 20%
What you can try first
- · Check breaker and outdoor disconnect
- · Replace remote batteries
- · Check for error codes on the indoor unit display
When to call us: Power is confirmed and remote is functional, but the unit still won't turn on.
When a cleaning helps, and when to call a repair pro
A good portion of “something is off” symptoms (musty smell, weak airflow, water dripping from the indoor unit, surface mold) trace back to a dirty blower wheel, clogged drain, or biofilm on the coil. A full disassembly cleaning solves those. If we get on site and find an electrical or mechanical fault (a failing capacitor, a stuck reversing valve, refrigerant issues), we will tell you and recommend a heat pump repair contractor. We do not do repairs ourselves.
Frequently asked questions
Is heat pump won't turn on dangerous?
Most causes of "heat pump won't turn on" are not immediately dangerous, but ignoring them can damage the system over time. Power is confirmed and remote is functional, but the unit still won't turn on.
Can a cleaning fix this?
Sometimes. Biofilm, dirty coils, and clogged drain lines often resolve after a deep clean. Mechanical or electrical issues need a heat pump repair contractor instead.
Do you do repairs?
No. We focus on cleaning and twice-yearly maintenance. If your system needs a part replaced or an electrical fix, we will tell you what we see and recommend a repair contractor.
Try a cleaning first.
If the symptom traces back to a dirty unit, we can fix it. If it does not, we will tell you and point you to a repair pro.