Diagnostic 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.
Our diagnostic process
We arrive within a one-hour window, inspect the system end-to-end, read any active error codes, test temperatures and pressures, and identify the actual cause. You get a written quote before any repair work starts. The $129 diagnostic fee is applied to any repair you proceed with.
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 or raise repair cost. 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 require a diagnostic visit instead.
How much does diagnosis cost?
Our diagnostic visit is $129 flat, applied to any repair you proceed with. We will quote any repair before starting work.
Need a tech to take a look?
$129 flat diagnostic. Same-week scheduling across Vermont. Credited toward any repair.