Hayward H400FDN User Manual

“IO” OR
“SB” Code
Check display for
“IO” code
Is “IO” code
present?
The “SB” code may
clear with a reset of
power, power cycle
the heater
YES
NO
Verify ignitor wiring is
not damaged and
plugged in securely
7. Service LED ON: “IO” OR “SB” Code
38
Is ignitor wire
damaged?
Replace ignitor:
FDXLIGN1930
YES
NO
Ohm ignitor, verify
8-25 ohms (20°-
140°F), reading out
of range?
YES
NO
Replace ICB:
FDXLICB1930
Replace
display/bezel/
keypad:
(See Pg. 20)

Hayward H400FDN Specifications

General

Type	Natural Gas
BTU Input	400, 000 BTU
Pool Type	In-ground
Heat Exchanger	Cupro Nickel
Voltage	120V
Efficiency	84%
Water Flow Rate	40-120 GPM
Inlet/Outlet Size	2 in
Ignition	Electronic