GE Appliances mini split error code 43
Low pressure switch open.
- TypeProtection
- SystemRefrigerant circuit
- Can I fix it?Homeowner checks, then maybe a tech
What 43 means on a GE Appliances
Suction pressure fell below the limit and the low-pressure switch opened. The manual locks the compressor out after this happens three times in an hour.
On this platform, 43 is a protection: the system stopped or throttled itself to prevent damage; many clear on their own once conditions return to normal.
Common causes
- Low charge from a leak.
- A service valve not fully open.
- A kinked line set.
- A frozen indoor coil.
How to fix it yourself
Work through the checks below first; they resolve most cases. If they do not, the repair itself may need a technician.
- Open every service valve fully.
- Pull the front panel and check the filters and the indoor coil. Dirty filters and a matted coil restrict airflow, and airflow problems trigger a surprising number of protection codes.
- Leak-check the flare joints.
- Anything inside the refrigerant circuit (sensors are fine, but valves, compressors and leaks are not) needs EPA-certified refrigerant handling. That is a technician job.
Switch off power at the breaker before opening either unit. Capacitors in the outdoor unit hold a charge for several minutes after power is cut.
When to call a technician
A technician must measure the charge and find the leak.
Which GE Appliances units show 43
This page applies to GE Appliances GE multi-zone ductless (ASH…JCDDA) units. GE Appliances's own documentation lists 43 as "Low pressure switch open", the same definition used across the Haier / GE multi-zone outdoor display it is built on. If your unit shows a code with a different shape (for example a four-character code, or a plain number), it is from a different table; use the lookup with your exact code.
Where GE Appliances shows this code
These numeric codes show on the Service Monitor Board display inside the multi-zone OUTDOOR unit (behind the service panel). The indoor units signal a fault with blinking lamps; the number on the outdoor board is what identifies it. Codes 1 to 27 are outdoor-unit faults and protections, 28 to 41 are temperature sensors (28 to 31 and 40 are zone liquid-pipe sensors, 32 to 36 are zone gas-pipe sensors), and 42 to 45 are pressure switches and limits.
Other GE Appliances codes
Same part of the system as 43:
43 on other brands
The same characters do not always mean the same thing. Check the brand on your unit.
- Haier 43 Low pressure switch open
Questions people ask
Can I reset a GE Appliances 43 code myself?
Yes. Turn the system off at the breaker for five minutes, then restart it. If 43 comes back, the fault is real and needs the checks above.
Is it safe to keep running a GE Appliances showing 43?
Not repeatedly. A protection code means the unit stopped itself to prevent damage, and resetting it over and over can turn a cheap repair into a compressor failure. Reset once, check the basics, and stop if it returns.
Do I need a technician for GE Appliances 43?
Work through the checks below first; they resolve most cases. If they do not, the repair itself may need a technician. A technician must measure the charge and find the leak.
Sources
- Haier / GE Ductless Multi-Split Heat Pump Service Manual (4.11.22), Error Codes table
Updated September 2026. Codes and definitions vary by model year. If your manual disagrees with this page, your manual wins. Send a correction.