Safety first: Turn the water heater off for propane odor, soot, delayed ignition, exhaust damage, overtemperature or leakage. Do not apply a code definition from another model or bypass a sensor, ECO, blower or gas-valve safety circuit.

Furrion tankless water-heater error codes are only useful after the model family is identified. On current 2.4 GPM FWH09-style models, E2 is a false flame signal that calls for service. On older F2GWH documentation, E2 means flame sensing was interrupted during normal operation. Treating those as the same fault can waste parts or create an unsafe reset loop.

Photograph the data plate, wall-control code and the conditions that triggered it before turning power off.

Find the model family behind the exterior door

Look for FWH09A and 2.4 GPM labeling on current models, or F2GWH labeling on the older family. Door size and thermostat appearance are not reliable identifiers because RV builders and replacement kits vary.

Use only the manual tied to the exact data plate and revision.

Furrion 2.4 GPM tankless gas RV water heater with its exterior access door open
A Furrion 2.4 GPM tankless water heater behind the exterior door. The model label—not the door shape or wall controller—determines which error-code chart and reset procedure apply.

Current FWH09 2.4 GPM code meanings

  • E0: outlet-temperature system fault—contact Furrion.
  • E1: flame sense during ignition; check fuel valves, fuel level and regulator operation.
  • E2: false flame signal detected—system fault requiring Furrion service.
  • E3: overtemperature mechanical sensor fault; run cold water 10–20 seconds, restart once and contact Furrion if it persists.
  • E4: inlet-temperature system fault—contact Furrion.
  • E5: air-pressure fault; check visible exhaust obstruction and strong wind before service.
  • E6: temperature surge; investigate water supply, air, low flow, cold-water crossover and a plugged filter.
  • E7: solenoid-valve system fault—contact Furrion.

Why older F2GWH codes need their own chart

Older F2GWH documentation defines E1 as ignition failure or flame loss during ignition and E2 as flame sensing interrupted during normal operation. It also defines E3 as ECO opening because outlet temperature exceeded 140°F, E5 as blower-motor failure and E6 as outlet overtemperature.

Those definitions do not match the current FWH09 2.4 GPM table. Never choose a chart by code alone.

Perform the safe supply checks first

For an ignition-related code, confirm propane fuel and open valves, stable 12V power and steady water flow. For E5 on a current FWH09, inspect the exterior exhaust for an obvious obstruction and note strong wind. For E6, purge air, verify the water tank or city supply and check for cold-water crossover at shower valves.

Do not reach into the burner, alter the pressure switch or test the gas valve without qualified service.

Use the model-specific reset

Current FWH09 instructions describe switching the front power control off, waiting about five seconds and switching it on after the underlying condition is addressed. Older F2GWH behavior may reset when hot-water demand is stopped and restarted for certain lockouts.

If the code returns, record it and stop resetting. Repeating a reset can hide a dangerous overtemperature or false-flame condition.

Treat E2 and persistent E3/E7 as service faults

On current FWH09 models, E2 is a detected false flame signal and the manufacturer’s action is to contact Furrion. Persistent E3 is also referred to service after the cold-water/restart step, and E7 concerns the solenoid circuit.

These are not owner-cleaning codes.

Tools and evidence for a faster repair

  • Useful items: data-plate photo, code photo, battery-voltage reading and notes on water flow/wind.
  • Owner checks: external supplies, visible exhaust obstruction, fixture crossover and model-approved reset.
  • Service work: false flame, sensors, blower, ECO, gas valve and internal wiring.
  • Most valuable detail: complete model number and whether the code appeared at ignition or during a long draw.

Related RV Solver pages

Frequently asked questions

What does E2 mean on a Furrion tankless water heater?

It depends on the model. Current FWH09 2.4 GPM manuals define E2 as a false flame signal/system fault, while older F2GWH documentation defines E2 as flame sensing interrupted during operation.

What does Furrion E6 mean?

On current FWH09 models, E6 is a temperature-surge code associated with cold-water surges, crossover, insufficient supply, trapped air, low flow or a clogged filter. Older families use different definitions.

How do I reset a Furrion tankless water heater?

Follow the exact model manual after correcting the cause. Current FWH09 instructions use the front power switch off, a short wait, then on; repeated codes require diagnosis.

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.