Girard GSWH-2 E1 Error: Ignition and Flame-Loss Checks

On a Girard GSWH-2 tankless water heater, E1 is an ignition failure or accidental flame loss during ignition. The controller attempts a limited relight sequence and then locks out if it cannot prove flame.

The best diagnosis follows the event: first prove the heater sees hot-water demand, then confirm propane reaches the coach, and finally use spark and flame timing to decide whether internal service is needed.

Confirm the model before using the code

Read the GSWH-2 label behind the exterior door. Girard and Furrion heaters can both display E-codes, but code meanings and reset procedures are not interchangeable. Preserve the code before cycling power.

Make sure the heater is actually being asked to run

Open one hot faucet enough to create steady flow and watch the control panel. Weak pump flow, a clogged fixture, bypassed plumbing or air in the line can prevent a clean demand signal. Purge air and test one unrestricted fixture.

If the unit never begins its fan/ignition sequence, E1 may be stored from an earlier event while the current problem is flow or control power.

Check propane supply outside the heater

Verify fuel level and fully open service valves. If the cylinder was changed, establish propane at another appliance following its manual, then turn that appliance off. An empty cylinder, tripped excess-flow condition, air in the branch or low regulator pressure can all leave the Girard unable to light.

Do not infer correct pressure from a stove flame alone. A technician must measure gas pressure under load.

Listen to the ignition sequence

• Fan runs, no clicking: igniter circuit, control or safety input may be involved.
• Clicks, no flame sound: propane delivery, igniter position, burner obstruction or gas valve needs diagnosis.
• Flame starts then E1 returns: flame sensing, ground, flame quality or gas-pressure stability may be involved.
• Delayed pop or soot: shut down immediately and arrange service.

Check the safe external items

With the appliance off and cool, inspect the exterior intake/exhaust for nests, mud, covers or storm damage. Confirm stable 12V supply because the blower, igniter, gas valve and controller all depend on it. Do not insert a tool into the burner orifice or spray cleaner into the combustion chamber.

Reset once after the supply problem is corrected

The GSWH-2 manual describes a lockout after unsuccessful ignition trials. After correcting an empty cylinder, closed valve or air in the line, turn hot-water demand off and follow the owner-manual reset for the installed control. If E1 returns, preserve the timing and stop cycling.

What a technician checks next

Girard’s service information lists the ECO state, gas supply, igniter and connections, igniter-to-burner relationship, debris between igniter and burner and low inlet pressure among E1 checks. These require access and measurements beyond a visual owner inspection.

Tools and repair boundary

• Owner tools: model photo, flashlight and battery-voltage display.
• Owner checks: water demand, LP valves/fuel, 12V supply and exterior obstruction.
• Technician checks: gas pressure, igniter, flame signal, ECO, gas valve and controller.
• Best clue: exactly how far the ignition sequence gets before E1.

Related RV Solver pages

• Girard tankless water heater no hot water
• Furrion tankless error codes by model
• RV water heater will not light on propane
• RV propane regulator symptoms
• RV water pump runs but no water
• RV water heater only lukewarm

Frequently asked questions

What does E1 mean on a Girard GSWH-2?

E1 means ignition failed or flame was lost during the ignition sequence. The unit locks out after its allowed relight attempts.

Can low water flow cause a Girard E1?

Low flow more often prevents a proper heat demand, but confirm steady flow first so the ignition sequence is being evaluated under valid conditions.

Why does my Girard light and then show E1?

A flame that appears and drops out points toward unstable propane pressure, flame quality, flame-sense/ground or related control service rather than a simple no-spark condition.