Haier Air Conditioner Error Code F1

Reviewed by the ApplianceErrors Editorial Team · Verified against manufacturer service documentation · Last verified: June 11, 2026

⚠ Medium Severity 🔧🔧 Moderate DIY

Indoor coil (evaporator pipe) temperature sensor fault

The most common cause of the F1 error on a Haier air conditioner is failed coil thermistor (~50% of cases); start with: power cycle.

💰 DIY cost: $10–$30 👨‍🔧 Pro cost: $120–$250 Save $110+ by doing it yourself

Haier Air Conditioner error code F1 on the display panel — How the F1 code appears on a Haier air conditioner display

What Does Error Code F1 Mean on a Haier Air Conditioner?

Indoor coil (evaporator pipe) temperature sensor fault.

F1 fires when the indoor control board reads the evaporator-coil thermistor outside its valid resistance range, usually an open or short circuit. Because this probe supplies the freeze-protection reference, the board can no longer verify coil temperature and may short-cycle or halt cooling to prevent icing. It differs from the room/air sensor fault codes, which monitor return-air temperature rather than the coil itself, and points specifically to the probe clipped into the coil's copper well.

Models affected: Haier split and window air conditioners that use an indoor evaporator coil thermistor for freeze protection

What owners report: Owners commonly report F1 appearing on startup or after cleaning the filter or coil, when the probe can get bumped out of its well. Reseating the sensor sometimes clears it for free; if not, the thermistor itself has usually drifted out of spec and a cheap replacement typically resolves it.

What Causes Error Code F1?

Here are the most common causes in order of frequency. Start with the most likely cause before moving to the next:

1

Failed coil thermistor 50% of cases
2

Sensor fallen out of its well on the coil 25% of cases
3

Loose connector on the indoor PCB 15% of cases
4

Indoor board failure 10% of cases

How to Fix Haier Air Conditioner Error Code F1

🔧🔧 Moderate DIY Est. time: 30–60 min

⚡ Safety first: Unplug the appliance before opening any panels or touching internal components.

1

Power cycle

Disconnect power for 5 minutes and restart.
2

Check the sensor placement

Open the front panel and verify the probe is fully seated in its copper well on the evaporator.

⚠️ Disconnect power before opening the indoor unit.
3

Replace the coil sensor

Out-of-spec resistance means a new probe — an inexpensive part.

🔩 Haier coil temperature sensor ($10–$30)

How to Reset Error Code F1

Disconnect power for 5 minutes, then restart.

Note: If the error returns after resetting, the underlying issue has not been resolved. Work through the fix steps above.

Did this guide fix your appliance?

When to Call a Professional

If a new coil sensor doesn't clear F1, the indoor board needs testing.

Average professional repair cost for this issue: $120–$250

Related Error Codes

Room temperature sensor fault

⚠ Medium Severity

Indoor–outdoor unit communication failure

⚠ High Severity

Same Code on Other Brands

Error code F1 appears on these other brands too. See every brand that shows F1 →

Samsung Microwave F-1

Keypad membrane failure — dead or stuck key

LG Oven F1

Oven temperature sensor open circuit

Whirlpool Dryer F01

Main control board failure

Whirlpool Oven F1

Control board failure

Find Replacement Parts

Use these links to find the exact replacement parts for your Haier Air Conditioner:

🔩

Search PartSelect

Haier Air Conditioner repair parts

🔧

Search RepairClinic

Step-by-step video guides

External links — ApplianceErrors.com is not affiliated with these retailers.

Frequently Asked Questions

Can I keep using my Haier Air Conditioner when error F1 appears? +

You often can for a cycle or two, but the sensor issue behind F1 will keep interrupting normal operation until it is fixed. Plan the repair rather than ignoring the code.

What most commonly causes F1 on a Haier Air Conditioner? +

Across reported Haier air conditioner repairs, the most frequent is failed coil thermistor (50% of cases), sensor fallen out of its well on the coil (25%), then loose connector on the indoor PCB (15%). Check them in that order before replacing any parts.

F1 keeps coming back after a reset — what should I check next? +

A reset only clears the stored F1 fault; if it returns, the sensor problem is still present. Move on to the physical checks — power cycle, then check the sensor placement — since the code will reappear until the root cause is resolved. This is a moderate job — a multimeter and some disassembly are usually involved.

How much does it cost to fix Haier Air Conditioner error F1? +

A DIY repair typically runs $10–$30 in parts, versus $120–$250 for a professional service call, so handling it yourself saves around $110. Expect the work to take roughly 30–60 minutes.

Which Haier Air Conditioner models show error F1? +

F1 is documented on Haier split and window air conditioners that use an indoor evaporator coil thermistor for freeze protection. Other units sharing the same control platform can display it too, so the fixes here generally transfer across the series.

Sources & References

• Haier Appliances Support — official manufacturer documentation
• Our editorial & verification policy

Content verified against manufacturer service documentation. Last verified: June 11, 2026.

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