Troubleshooting 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.
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 green light blinking dangerous?
Most causes of "heat pump green light blinking" are not immediately dangerous, but ignoring them can damage the system over time. 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 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.