e5
Easy Fix
York · HVAC Systems (AC, Furnaces, Heat Pumps & Thermostats)
Outdoor Ambient Temperature Sensor Fault
Quick Answer
Error code E5 on your York HVAC Systems (AC, Furnaces, Heat Pumps & Thermostats) means: Outdoor Ambient Temperature Sensor Fault. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Locate the outdoor ambient temperature sensor on the outdoor unit
2
Measure the sensor resistance with a multimeter and compare to the expected value for current outdoor temperature
3
Check the sensor wire and connector for physical damage or corrosion
4
Verify the sensor is securely mounted in its intended position
5
Replace the sensor if the resistance reading does not match the expected value
Pro Tip
This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.
Parts You May Need
Outdoor ambient thermistor
Sensor mounting bracket
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