Safety first: Turn the AquaGo off for propane odor, soot, delayed ignition, water leaking from the appliance, freeze damage or a fault that returns. Burner, gas-valve and internal electrical work requires Truma-qualified service.

When a Truma AquaGo produces no hot water, watch what happens when one hot faucet opens. A normal unit detects flow, starts its combustion sequence and regulates the outlet near 120°F before the faucet mixes in cold water.

No burner attempt points toward mode, power or water-flow detection. An ignition attempt followed by a fault points toward propane or combustion. Hot water at the unit but lukewarm water at every fixture points back to RV plumbing and mixing.

Confirm the control is awake and in a heating mode

On an analog control, select Eco or Comfort and look for the normal amber status indication. A dark knob may be asleep; Truma advises a slow off/on movement to wake it. If the light flashes, record whether it is slow, rapid or a fault pattern before changing settings.

Clean mode does not provide normal burner operation. If the control was moved to Clean accidentally, use the dedicated recovery procedure.

Check both 12V and propane

AquaGo uses 12V DC for its controls, circulation pump and combustion components. Confirm the RV fuse, battery disconnect and battery condition. Then verify propane supply and open service valves. A cooktop flame can establish that propane reaches the coach, but gas pressure and AquaGo components still require service instruments.

If the unit tries to ignite and reports E1, preserve the code and follow the no-flame path rather than cycling it repeatedly.

Make sure water flow reaches the activation threshold

Truma states that the burner starts when hot-water flow exceeds approximately 0.4 gallons per minute. Open one hot faucet fully for the test. A low-flow aerator, clogged shower head, partially open valve or weak pump can keep flow below the trigger.

Do not diagnose from a dribble. Compare flow at several hot fixtures and remove only an easily cleaned aerator with the water off.

Return bypass valves and filter parts to service position

After winterization, verify the RV bypass valves are in normal operating position. Confirm the yellow Easy Drain Lever is latched and the filter cartridge and O-rings are correctly seated. A bypassed or empty AquaGo cannot produce normal hot water.

Do not apply propane heat to a unit that may be empty or frozen.

Purge air from every hot line

Truma identifies trapped air as a common cause of circulation fault W27. Open hot fixtures one at a time until sputtering stops and flow is steady. Purge the outside shower and any washer or remote fixture that may hold air.

After purging, close all but one fixture and retry. Multiple open outlets can create W29 because demand exceeds available heat output.

Separate heater output from cold-water crossover

If the outlet pipe at the AquaGo becomes hot but every faucet is lukewarm, inspect the outside shower and handheld shower valves. Leaving hot and cold valves open while closing only the shower-head stop can cross-connect cold water into the hot system.

Also check winterization valves and mixing fixtures before assuming the AquaGo is underheating.

Use the fault code before resetting

Digital CP plus controls show alphanumeric codes; analog installations use a red LED behind the exterior access door. Record the full short/long flash sequence. E1, W27, W29 and W30 describe very different conditions, and each has its own safe response.

Tools, difficulty and next step

  • Owner tools: flashlight, measuring container/timer, model photo and battery-voltage display.
  • Owner checks: mode, fuse, propane supply, flow, bypass position, filter seating and air purge.
  • Service checks: burner, gas pressure, flow sensor, circulation pump, internal wiring and repeating faults.
  • Best evidence: control light, flow rate, ignition sound and exact code.

Related RV Solver pages

Frequently asked questions

How much water flow starts a Truma AquaGo?

Truma says the burner starts when hot-water flow is greater than approximately 0.4 gallons per minute. Restrictive fixtures or weak supply can prevent activation.

Why is my Truma AquaGo on but not firing?

The control may be in the wrong mode, 12V or propane may be missing, water flow may be below the trigger, air may be trapped, or a stored fault may be blocking operation.

Why is AquaGo water hot at one faucet but lukewarm elsewhere?

That points toward fixture flow, a shower valve cross-connection or another RV plumbing issue rather than a total heater failure.

Still narrowing it down?

The guided troubleshooter walks through the symptom in a safe order and points you toward the right RV system.

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Sources and review notes

Reviewed against manufacturer material on July 12, 2026. Match every procedure, limit and replacement part to the exact model, serial range and manual installed in the RV.