Quick diagnosis
What this code is telling you
Most likely trigger
Low air flow over evaporator coil
Recommended replacement
Freeze Thermostat Sensor
Diagnostic path
4 ordered checks
Part fit
Exact model number required
Safety first
Before opening the appliance
Unplug the appliance before removing panels or testing internal components. Do not bypass safety switches or live-test high-voltage, gas, refrigerant, or combustion components unless you are qualified to do so.
Read the full safety disclaimerRoot cause
Why the control reported this error
The air-conditioner control reports this fault when it cannot verify a normal sensor, fan, drainage, or cooling condition. Check low air flow over evaporator coil first, then inspect low system refrigerant charge and defective freeze stat sensor before replacing freeze Thermostat Sensor.
Symptoms
What you may notice
- ✓Indoor air handling unit blowing warm air
- ✓Ice visible on suction copper line set
- ✓Display shows F2
Possible causes
Check the most likely causes first
- 1
Low air flow over evaporator coil
Start here when it matches your symptoms.
- 2
Low system refrigerant charge
- 3
Defective freeze stat sensor
- 4
Blower motor failing
Diagnostic sequence
Work through these checks in order
Stop when you find the fault. Do not perform a step that requires skills or live testing you are not qualified to do.
- 1
Check 1
Turn thermostat to FAN ON and COOL OFF to thaw coil completely.
- 2
Check 2
Replace clogged air filter.
- 3
Check 3
Clean dirty air evaporator coil fins.
- 4
Check 4
Contact technician to test system operating pressure and leak check.
Replacement part reference
Freeze Thermostat Sensor
Exact OEM part number
Model number required
Fitment note
The exact OEM part number varies by model and production revision. Verify the complete model number before ordering.
Verify the appliance model before ordering.
Manufacturers can use different parts under the same error code across model families and production revisions.
Where do I find my model number? →FixCodeDB may earn a commission from qualifying purchases made through affiliate links.
Common questions
Quick answers for this fault
What should I check first for F2?
Start with low air flow over evaporator coil. If that checks out, continue through the diagnostic sequence above rather than replacing a part based on the code alone.
Does F2 always mean Freeze Thermostat Sensor is bad?
No. An error code identifies the condition the control detected, not a guaranteed failed part. Confirm the likely causes and wiring first. The exact OEM part number varies by model and production revision. Verify the complete model number before ordering.
When should I stop troubleshooting F2 myself?
Stop if the next step requires live electrical testing, sealed-system work, gas or combustion service, or any procedure outside your training. Unplug the appliance before removing panels or testing internal components. Do not bypass safety switches or live-test high-voltage, gas, refrigerant, or combustion components unless you are qualified to do so.
Was this useful?
Did these checks help with your York F2 error?
Keep diagnosing
Related York guides
Different problem?
Search another code or symptom
Go back to the main diagnostic search and try the code, symptom, appliance, component, or brand.
Open diagnostic search →