Diagnostic guide
Heat pump green light blinking? Here is what is happening and what to do.
A blinking green light on a mini-split usually indicates an active error code. The blink pattern (number of blinks, pause length) corresponds to a specific error in the manufacturer's diagnostic chart. Count the blinks, look up the brand's error code chart, or call us with the pattern.
Likely causes, ranked by probability
- 1
Active error code being communicated via blink pattern
Pattern matches a specific fault.
Likelihood 100%
What you can try first
- · Count the number of blinks in a sequence and note the pause length
- · Look up the pattern in the unit's manual
When to call us: Any persistent blink pattern indicates a code that needs diagnosis.
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 green light blinking dangerous?
Most causes of "heat pump green light blinking" are not immediately dangerous, but ignoring them can damage the system or raise repair cost. Any persistent blink pattern indicates a code that needs diagnosis.
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.