Carrier / Comfort 22
Carrier EH0E error code
EH0E means the indoor unit is reporting a water-level alarm malfunction. Treat it seriously because condensate faults can lead to water damage.
- Urgency
- advisory
- Verified
- Jul 31, 2026
- Fix path
- Technician
What it means
EH0E means the indoor unit is reporting a water-level alarm malfunction. Treat it seriously because condensate faults can lead to water damage.
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 EH0E as water-level alarm malfunction.
- The manual troubleshooting table says improper drainage can cause poor operation or shutdown symptoms.
- A water-level alarm/control condition that remains after one safe reset.
Homeowner fix
Turn the system off if water is visible. Check only the outside end of the drain for an obvious blockage or kink, then power reset once if everything is dry and safe. Do not open the indoor unit.
When to call a pro
Call a licensed HVAC technician if EH0E returns, water is visible, or the drain path is not obvious. Tell them Carrier lists EH0E as water-level alarm malfunction.
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: inspect condensate pan, float/water-level input, drain path, pump where installed, wiring, 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, zero, and letter E 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