Rheem ProTerra heat pump water heaters use A-prefix and T-prefix alert codes (like A102), not the generic E1/E2/E3 codes several low-quality sites list. Rheem’s own maintenance article doesn’t publish a code table — owners have to rely on the EcoNet app or the unit’s own display, which this page is working to document accurately.
Several sites publishing “Rheem heat pump water heater error codes” list generic E1/E2/E3 codes. Rheem’s real ProTerra system uses A/T-prefix alerts. Don’t trust a page that gives you E-codes for this unit — check your EcoNet app or unit display for the actual prefix before searching further.
Codes at a Glance
| Code | Meaning | |
|---|---|---|
| A102 | Alert reported by owners right after installation — seen in a forum thread as “error A102 on startup, brand new” | Guide coming soon |
| A105 | Referenced in real search results without a confirmed public meaning yet | Guide coming soon |
FAQ
Where do I find my Rheem ProTerra’s actual alert code?
Check the EcoNet app if the unit is connected, or the unit’s own front-panel display. Rheem also offers a “Fix It Tool” on its own site that walks through diagnosis by code.
Written by HotWater Decoded — water heater repair specialists. Technically reviewed by a licensed technician on our team.
- A Reddit/plumbingforums thread confirming the A102 alert-code format
- Rheem’s own “Fix It Tool” diagnostic system
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