W30

Truma Water Heater: “W30”

warning RV water heater fault codes

Safety Freeze damage can crack internal components and cause leaks. Draining is the safest option for cold storage. No gas/electrical hazard in the drain procedure, but follow the manual's drain steps to avoid water damage.

What it means

Risk of freezing. The temperature inside the AquaGo has fallen below roughly 27 F (about minus 3 C), warning that the unit could be damaged by freezing.

Most likely causes

Ambient temperature below freezing while unit holds water most likely
Heater left unheated in cold weather common

Safe checks you can do yourself

Move the RV to a warmer location if possible
Run the heater in eco or comfort mode so warm water circulates, if freezing is only marginal
If storing in the cold, fully drain the AquaGo to prevent freeze damage

How to reset / clear W30

Warm the unit or drain it completely; the warning clears once the internal temperature rises above the freeze threshold

When to call a technician

If you suspect the unit already froze and you find leaks or no hot water after thawing.

Applies to

Truma AquaGo basic · Truma AquaGo comfort · Truma AquaGo comfort plus

FAQ

What does Truma Water Heater code "W30" mean?

Risk of freezing. The temperature inside the AquaGo has fallen below roughly 27 F (about minus 3 C), warning that the unit could be damaged by freezing.

How do I reset Truma Water Heater W30?

Warm the unit or drain it completely; the warning clears once the internal temperature rises above the freeze threshold

What is the most common cause of W30 on a Truma Water Heater?

The most likely cause is ambient temperature below freezing while unit holds water.

Related · Truma water heater

E1
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Room-temperature sensor warning on the Combi: the CP plus ha… W27
Water circulation pump running dry. The internal circulation…

Sources

Tech Tip: Truma AquaGo Error Codes — Truma US official tech tip, code W30 risk of freezing below 27 F (Truma (manufacturer))
Truma — Water Heater Model AquaGo Error Codes — Appendix A Error Codes, W30 (Forest River (component manual archive))

Note: Freeze threshold cited as approximately 27 F (-3 C) by Truma; exact trigger temperature may vary slightly by firmware.

● Last verified 2026-06-29 · compiled from manufacturer documentation. Codes can vary by model year — always cross-check your unit’s manual.