Truma Water Heater: “W29”
info RV water heater fault codes
What it means
Excessive heat demand. The unit is running at full capacity but cannot maintain the target hot water temperature because too much hot water is being drawn at once.
Most likely causes
- Multiple hot water outlets running simultaneously most likely
- Very high flow rate exceeding the heater's output common
- Very cold incoming water reducing achievable temperature less common
Safe checks you can do yourself
- Reduce how many hot water taps are open at the same time
- Lower the flow rate at the faucet or showerhead
- Wait for the unit to catch up before resuming heavy use
How to reset / clear W29
- Reduce simultaneous hot water usage; the warning clears on its own once demand drops within capacity
When to call a technician
Rarely needed; only if the unit shows W29 even with a single low-flow outlet, which could indicate a sensor or heating issue.
Applies to
Truma AquaGo basic · Truma AquaGo comfort · Truma AquaGo comfort plus
FAQ
What does Truma Water Heater code "W29" mean?
Excessive heat demand. The unit is running at full capacity but cannot maintain the target hot water temperature because too much hot water is being drawn at once.
How do I reset Truma Water Heater W29?
Reduce simultaneous hot water usage; the warning clears on its own once demand drops within capacity
What is the most common cause of W29 on a Truma Water Heater?
The most likely cause is multiple hot water outlets running simultaneously.
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Sources
- Tech Tip: Truma AquaGo Error Codes — Truma US official tech tip, code W29 excessive heat demand (Truma (manufacturer))
- Truma AquaGo basic Operating Instructions — Appendix A Error Codes — Operating Instructions Appendix A, Error Codes table (Truma / ManualsLib)
Note: Target temperature figure (around 120 F / 49 C) is the factory default and may vary by model/setting.
● Last verified 2026-06-29 · compiled from manufacturer documentation. Codes can vary by model year — always cross-check your unit’s manual.