Bradford White · AeroTherm Series G2
Bradford White AeroTherm Series G2 error code 18
Water Leak Detected
What it means
The control has detected a water leak.
Also listed in: Quick Service Guide, Heat Pump Water Heaters AeroTherm Series (Service Manual Supplement), 238-55219-00A, page 2
What Bradford White says to do
The manual gives no specific step for this code. Check the troubleshooting and maintenance sections on the AeroTherm Series G2 page, or call a qualified technician.
Last checked 2026-10-03.
Safety first
- WARNING: Turn OFF the electrical supply to the unit before installation and before removing any access panels to service the heater. (p.3, p.24)
- DANGER: Shut OFF power to the water heater before draining water to avoid electrocution. (p.29)
- CAUTION: For your safety, do NOT attempt to repair the water heater or any of its parts. Refer any repairs to a qualified service technician. (p.28)
From the manufacturer's manual for this series.
Other AeroTherm Series G2 codes
- 1 (Lower Temp Sensor - T1 fault)
- 3 (Lower Element Fault)
- 4 (Upper Element Fault)
- 5 (Control Fault)
- 6 (Supply Voltage Fault)
- 7 (Tank Over Temp Fault)
- 8 (Fan Fault)
- 9 (Compressor Fault)
- 10 (Superheat Fault)
- 11 (Airflow Restriction)
- 12 (Evap Outlet Sensor - T3B Fault)
- 13 (Evap Inlet Sensor - T3A Fault)
- 14 (Compressor Outlet Sensor - T4 Fault)
- 15 (Ambient Sensor - T5 Fault)
- 16 (Ambient Temp Hi/Lo)
- 17 (Compressor Hi Temp Fault)
- 92 (Heating Relay Fault)
- 93 (Element Hard Fault)
- 94 (Condensate Fault)
- 95 (EEV Hard Fault)
- 96 (Superheat Hard Fault)
- 97 (Compressor Hard Fault)
- 98 (Fan Hard Fault)
- 99 (Upper Temp Sensor - T2 fault)