Bradford White · Heat pump RE2H (-1NCWT models)
Bradford White Heat pump RE2H (-1NCWT models) error code Fd
What it means
Control checks to ensure evaporator superheat is OK (controlled by EEV). Continuously verifies the temperature difference between T3a sensor (evap inlet temp) and T3b sensor (evap outlet temp) is greater than 5F after 30 mins of run time. Control also verifies that T3a is greater than 10F less than T5 ambient sensor.
The manual says the control must detect this 10 time(s) before the code is displayed.
What Bradford White says to do
These steps involve electrical testing or parts replacement. Bradford White's manuals tell owners to leave that work to a qualified service technician.
Possible refrigerant leak. Check sealed system for leak. Check that filter is clean. Check T3a, T3b and T5 sensor mounting, wiring and resistance. Check EEV wiring at control, coil placement, and operation.
Last checked 2026-10-03.
Safety first
- DISCONNECT POWER BEFORE SERVICING. IMPORTANT: RECONNECT ALL GROUNDING DEVICES. All parts capable of conducting electrical current are grounded; grounding wires, screws, straps, clips, nuts or washers removed for service must be returned to their original condition and properly fastened. (p.1)
From the manufacturer's manual for this series.
The same code on other models
Codes mean different things on different heaters. Match the series to the model number on your rating label.