Carrier / Comfort 22
Carrier EH65 error code
EH65 means the T2A evaporator coil inlet temperature sensor circuit is open or shorted. The indoor unit cannot rely on that temperature reading.
- Urgency
- advisory
- Verified
- Jul 31, 2026
- Fix path
- Technician
What it means
EH65 means the T2A evaporator coil inlet temperature sensor circuit is open or shorted. The indoor unit cannot rely on that temperature reading.
Urgency
advisory
Try only the safe reset/check in the owner's manual. If the code returns, stop using the system until it is diagnosed.
Likely causes
- Carrier Table 4 identifies EH65 as evaporator coil inlet temperature sensor T2A open circuit or short circuit.
- A sensor circuit that remains open/shorted after the manual's wait/reset guidance.
Homeowner fix
Turn the system off with the remote, wait about 10 minutes, then power cycle once at the breaker or disconnect if you can do that safely. If the code returns, stop resetting and schedule service. Do not open the indoor or outdoor cabinet.
When to call a pro
Call a licensed HVAC technician if EH65 returns. Tell them Carrier identifies EH65 as evaporator coil inlet temperature sensor T2A open/short fault.
This code points to electrical or inverter work - get repair quotes from contractors in your area.
Get repair quotesRepair vs replace
This is normally a repair diagnosis, not an automatic replacement signal. If a technician confirms a major board, compressor, fan-motor, or sealed-system repair on older out-of-warranty equipment, compare the quote with replacement.
See Carrier mini-splitsYour Carrier model
Comfort 22 model pages in the Carrier catalog help compare this repair path with current replacement options.
- Carrier Comfort 22 9,000 BTU R-454B 115V (45MHHAQ09XC1 / 37MHRAQ09AA1)
Comfort 22
- Carrier Comfort 22 9,000 BTU R-454B 208/230V (45MHHAQ09XC3 / 37MHRAQ09AA3)
Comfort 22
- Carrier Comfort 22 12,000 BTU R-454B 115V (45MHHAQ12XC1 / 37MHRAQ12AA1)
Comfort 22
- Carrier Comfort 22 12,000 BTU R-454B 208/230V (45MHHAQ12XC3 / 37MHRAQ12AA3)
Comfort 22
For your technician
Technician note: verify T2A sensor continuity/resistance, connector, harness routing, and indoor PCB input. Page context: Carrier maps this display to the Comfort 22 line; source: Carrier 45MHHAQ High Wall Heat Pump Owner's Manual, Table 4 Error Codes; display convention: match the letter E, letter H, and sixty five marker exactly before comparing neighboring codes.
Which systems show it
Comfort 22
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
- Carrier 45MHHAQ High Wall Heat Pump Owner's Manual, Table 4 Error Codes