Lippert water heater · 1 model line
Lippert water heater code E4: Water inlet temperature probe failure
Lippert documentation lists E4 as “Water inlet temperature probe failure”.
What code E4 means by model
| Model line | What the manufacturer says | Source |
|---|---|---|
| Girard GSWH-2 | The Lippert Girard GSWH-2 owner manual lists E4 as water inlet temperature probe failure. | Lippert Girard GSWH-2 Tankless Water Heater Owner's Manual CCD-0006120 |
What you can safely check
- Turn hot-water demand off and power-cycle once only from normal controls.
- Record the code, set temperature, displayed temperature, and water-flow state.
- Contact Lippert/Girard or a qualified technician if E4 returns.
Stop and call a technician for
- Internal sensor, ignition, flame-sense, ECO, blower, pressure-switch, linear-valve, wiring, gas, and controller diagnosis is qualified service work.
The Girard GSWH-2 is an LP gas tankless water heater. Shut the heater off for gas odor, overheating, leaks, blocked exhaust, or repeated faults and use Lippert/Girard or qualified RV service.
Write this down before you call
- Girard GSWH-2 model label
- user control panel code
- set and displayed temperature
- water-flow state
- LP and 12V status
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…
- 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
- 1 flash Air fault
- 2 flashes Flame detection error
- 3 flashes Lockout
- 4 flashes Intentionally NA and reserved for future diagnostics
- 5 flashes Low voltage