Lippert water heater · 2 model lines
Lippert water heater code 1 flash: Air fault
Lippert documentation for 2 model lines lists 1 flash as “Air fault”.
Check your model first. The same code can mean different things on different models. Find the model number on the appliance's data label, then use the matching row below.
What code 1 flash means by model
| Model line | What the manufacturer says | Source |
|---|---|---|
| Girard GSWH-1 | The Lippert Girard GSWH-1 owner manual lists 1 flash on the diagnostic LED as air fault. | Lippert Tankless Water Heater Model GSWH-1 Owner's Manual - EN/FR |
| Girard GSWH-1M | The Lippert Girard GSWH-1M owner manual lists 1 flash on the diagnostic LED as air fault. | Lippert Tankless Water Heater Model GSWH-1M Owner's Manual - EN/FR |
What you can safely check
- Turn hot-water demand off and power-cycle once only from normal controls if safe.
- Record the exact LED state, water-flow state, LP status, 12V status, and whether the same pattern repeats.
- Contact Lippert/Girard or a qualified technician if the LED pattern returns.
Stop and call a technician for
- Internal ignition, airflow, flame-sense, gas, blower, wiring, 12V diagnostics, ECO, winter-use-device, and controller work is qualified service work.
The legacy Girard GSWH-1/GSWH-1M is an LP gas tankless water heater. Shut the heater off for gas odor, overheating, leaks, blocked exhaust, repeated lockout, or repeated LED faults and use Lippert/Girard or qualified RV service.
Write this down before you call
- Girard GSWH-1 model label
- diagnostic LED blink pattern
- power switch state
- hot-water flow state
- LP and 12V status
- Girard GSWH-1M model label
Other codes on Lippert Girard tankless water heaters
Full table: Lippert Girard tankless water heaters
- E0 Water outlet temperature probe failure
- E1 Ignition failure or accidental flame off during ignition
- E2 Flame sensing interrupted during normal operation and the buzzer will sound
- E3 ECO open before ignition or during normal operation, commonly from outlet water temperatu…
- E4 Water inlet temperature probe failure
- E5 Blower motor failure because no motor signal was detected before ignition or during opera…
- E6 Over temperature because outlet water temperature exceeded 140 F for 3 seconds
- E7 Linear valve failure detected in the control circuit before ignition or during operation
- E8 Air pressure switch not detected before ignition or cut off during normal operation
- E9 Flame sensor error because flame is sensed before ignition and the buzzer will sound
- En System timer because the water heater ran longer than 20 minutes
- Fd Fd as winter-use mode or freeze protection; the unit may run briefly and shut off in free…
- steady on Internal control fault
- 2 flashes Flame detection error
- 3 flashes Lockout
- 4 flashes Intentionally NA and reserved for future diagnostics
- 5 flashes Low voltage