Klimaire / Klimaire KIWQ-KOIQ DIY
Klimaire F8 error code
F8 means 4-way valve reversing abnormal. In plain English, the reversing valve did not switch refrigerant flow as expected.
- Urgency
- advisory
- Verified
- Jul 31, 2026
- Fix path
- Technician
What it means
F8 means 4-way valve reversing abnormal. In plain English, the reversing valve did not switch refrigerant flow as expected.
Urgency
advisory
Do not keep forcing heating/cooling if the code returns.
Likely causes
- 4-way valve coil wiring is loose or damaged
- 4-way valve coil has failed
- Outdoor PCB is not driving the valve correctly
- Reversing valve is mechanically stuck
Homeowner fix
Power cycle once if safe. If heating or cooling is weak, reversed, or the code returns, leave the system off and call for service.
When to call a pro
Call a licensed HVAC technician if F8 returns after one safe reset or the condition will not clear. Tell them the official source lists F8 as 4-way valve reversing abnormal.
This code points to refrigerant or sealed-system and electrical or inverter work - get repair quotes from contractors in your area.
Get repair quotesRepair vs replace
This fault is usually repairable. Replacement is worth comparing only if an older system also needs major board, compressor, or refrigerant-circuit work.
See Klimaire mini-splitsYour Klimaire model
Klimaire KIWQ-KOIQ DIY model pages in the Klimaire catalog help compare this repair path with current replacement options.
- Klimaire KIWQ-KOIQ DIY 9,000 BTU R-454B 110-115V (KIWQ09H1-45T / KOIQ09H1-45T)
Klimaire KIWQ-KOIQ DIY
- Klimaire KIWQ-KOIQ DIY 12,000 BTU R-454B 110-115V (KIWQ12H1-45T / KOIQ12H1-45T)
Klimaire KIWQ-KOIQ DIY
- Klimaire KIWQ-KOIQ DIY 12,000 BTU R-454B 208-230V (KIWQ12H2-45T / KOIQ12H2-45T)
Klimaire KIWQ-KOIQ DIY
- Klimaire KIWQ-KOIQ DIY 18,000 BTU R-454B 208-230V (KIWQ18H2-45T / KOIQ18H2-45T)
Klimaire KIWQ-KOIQ DIY
For your technician
Technician note: verify 4-way valve voltage, coil resistance, wiring, PCB output, and valve operation. Source: Klimaire KIWQ-KOIQ DIY 5th Generation Service Manual, section 3.1 Failure code and section 3.2 Troubleshooting where available. Page context: Klimaire maps this display to the Klimaire KIWQ-KOIQ DIY line; source: Klimaire KIWQ-KOIQ DIY 5th Generation Service Manual, section 3.1 Failure code and 3.2 Troubleshooting; display convention: match the letter F and eight marker exactly before comparing neighboring codes.
Which systems show it
Klimaire KIWQ-KOIQ DIY
Related troubleshooting
Use the symptom guide alongside the exact display code if the unit is flashing, cycling, or showing comfort symptoms.
Related codes
Source
- Document
- Klimaire KIWQ-KOIQ DIY 5th Generation Service Manual, section 3.1 Failure code and 3.2 Troubleshooting