Carrier Aircon EH0E Error Code
Use this Carrier EH0E error code guide to decide when to stop resetting, what to capture, and what to check before parts are quoted. Match the model first; same-looking codes can point to different rows.
What Does Carrier EH0E Mean?
Carrier EH0E is listed as water-level alarm malfunction and water level alarm malfunction in Wall-Mounted Split, Inverter Split, Ceiling Cassette rows such as 45MHHAC high-wall cooling only, 45M cassette, ducted, ceiling / floor console. The loaded row is source-backed by official diagnostic material. Do not collapse this code across model families; use the model, series, or system type to choose the right row. Confirm the exact model, series, or signal row before accepting a parts quote.
Blocked drain pipe, trap, or concealed drain route.
Float switch or drain-level protection triggered by water in the pan.
Drain pump, drain slope, or pan-level issue after clearing is attempted.
What To Do Now
Use these steps before running the unit again or approving drain or pump work.
Stop using the unit if EH0E returns
Stop using the unit if EH0E returns, water leaks, or the drain pan keeps filling.
Reset EH0E once
Capture the EH0E display, then stop the unit if water is leaking or the drain pan looks full. Power-cycle once only if the area is dry.
Send these to us
EH0E error code, a clear display photo, Carrier model stickers, affected rooms, reset result, and where water appears
Send Us What You're Seeing
Share EH0E, your Carrier model, and what happened before it appeared. We'll read it and respond with the right next step before any work is approved.
What To Check Before Repair
Use this split to separate safe evidence capture from the tests a technician should prove before quoting parts.
| You Can Check | Technician Should Confirm |
|---|---|
| Before resetting EH0E, take a clear display photo. | Confirm whether EH0E is drain overflow, float switch, pump, or water-level protection. |
| Capture the Carrier indoor and outdoor model stickers so the correct family row is used. | Clear and flow-test the drain route, then check pan level and float operation. |
| Note whether one room, several rooms, or the whole system is affected, plus whether it returns after one reset. | Test pump power, pump discharge, and slope on cassette or concealed units. |
What Changes The Next Step
These clues decide whether the first check is room-side, shared outdoor-side, refrigerant-side, source-table, or model-family confirmation.
| What You See | What It Points To |
|---|---|
| Only one indoor unit shows EH0E. | The affected room, indoor board path, wiring route, or local component should be checked first. |
| Several rooms or the outdoor unit show the same EH0E fault. | The shared outdoor side, power path, communication trunk, or refrigerant circuit needs priority checking. |
| Water appears at the indoor unit or ceiling area. | Drain flow, float switch, pump, and pan level should be checked before running again. |
| The same code appears with different meanings in the source rows. | Model family, source table, and system type decide which meaning applies before parts are quoted. |
| The model belongs to Wall-Mounted Split, Inverter Split, Ceiling Cassette rows such as 45MHHAC high-wall cooling only, 45M cassette, ducted, ceiling / floor console. | The loaded row is source-backed by official diagnostic material. Use the matching source row before quoting parts. |
Drain Clearing Or Pump Decision
Carrier EH0E normally stays in repair scope: clear the drain, test the float or pump, and check slope before discussing replacement.
A blocked drain is usually a service-level repair if flow returns after clearing.
Pump or float-switch work needs part testing before replacement is approved.
Concealed drainage problems become labour-heavy because access decides the repair path.
Read Next
Use these if the quote mentions the parts, checks, or repair path this code points to.
Other Carrier Error Codes
If the code you're seeing isn't EH0E, jump to one of these or browse the full Carrier list.
Ready to Get Started?
Send the EH0E error code, a clear display photo, and Carrier model sticker. Send the model sticker so the matching official row can be checked quickly. We can help separate drain clearing, float, pump, and slope checks.