Haier air conditioner F19 code: supply voltage too high or low (split)

On split and mini-split systems, the outdoor unit has detected that the power supply voltage is too high or too low and has stopped to protect itself. Brownouts, surges and loose wiring are the usual causes.

Likely causes

Listed from most to least common.

1. Brownout or voltage dip during high demand
2. Power surge or storm
3. Loose connection in the supply wiring
4. Other large appliances on the same circuit
5. Voltage sensing circuit on the outdoor board faulty

How to fix the F19 code

Unplug the air conditioner or switch it off at the breaker before removing any panel or filter.

1. 1

   Step 1: Turn the system off

   Switch the AC off and turn off its breaker.

2. 2

   Step 2: Check for wider power problems

   Look for flickering or dim lights in the house. If the whole house is affected, wait for the power to settle or contact your utility.

3. 3

   Step 3: Reset the power

   Leave the breaker off for 5 minutes, then turn it back on and restart the AC.

When to call a technician

If F19 keeps returning while the house power seems normal, an electrician or HVAC technician should check the supply voltage, wiring and outdoor board.

A typical repair for this code costs $150–$500 in the US, including parts and labor. Prices vary by area and model.

Models this applies to

• Ductless mini-split and wall-mounted split ACs
• Inverter split heat pumps
• Portable air conditioners (US, 2017 and newer)

Codes can differ slightly between models. Your owner's manual is the final word and is available from Haier support.

Common questions