Troubleshooting guide

Furrion tankless water heater freeze mode or freeze damage

Use this when a Furrion tankless water heater shows freeze-protection behavior, Fd winter-use mode, or visible freeze-damage/leak symptoms after improper winterization.

Use this atlas to identify likely meaning and prepare for service. Shut off power, LP gas, fuel, or water when a listed appliance condition involves flame, gas smell, exhaust, generator shutdown, high temperature, moving jacks/slides, refrigerant, 120 VAC, control boards, repeated ignition failure, or a persistent lockout. Call the appliance maker, RV dealer, or a qualified RV technician for repair.

Owner-safe checklist

Shut off water, LP, and power if the heater is leaking or visibly damaged.
Do not rely on freeze-protection mode to winterize the entire RV plumbing system.
Photograph visible damage, the display state, model label, and winterization history for warranty or service.
Contact Lippert/Furrion or a qualified RV technician before operating a suspected freeze-damaged heater.

Code tables for these appliances

Furrion tankless water heaters 12 codes

Related fault codes

Furrion water heater code Fd: Winter-use mode or freeze protection; the unit runs briefly and shuts off in freezing conditions when LP and 12V power are on

Official sources

FurrionFurrion F2GWH Tankless Water Heater User Manual CCD-0005833 FurrionLippert QR-181 Tankless Water Heater Freeze Damage Identification FurrionFurrion 2.4GPM Tankless Gas Water Heater User Manual CCD-0005507 FurrionLippert Winter Use and Winterization of the Tankless Water Heater Video FurrionFurrion 144GPH/2.4GPM Flangeless Tankless Gas Water Heater Spec Sheet