Hayward H400FDN User Manual

“LO” Code
Verify adequate
water flow, is
flow sufficient?
Is water pressure
switch wiring free of
damage?
YES
NO
46
Increase flow
rate/clean filter
11. Service LED ON: “LO” Code
YES
Replace wire
harness:
FDXLWHA1930
NO
Check continuity of
water pressure
switch, is continuity
present?
NO
Replace water
pressure switch:
FDXLWPS1930
YES
Adjust switch
if necessary
Did error
clear?
Problem
solved
YES
Verify high
limit wires
are free of
damage
NO
Are wires free
of damage?
Replace high
limits kit:
FDXLHLI1930
NO
YES
Is this heater
installed
indoors?
YES
Go to
section B
(next page)
NO
Heater made
after Feb.
2016?
YES
NO
Contact
Support
(908) 355-7995
YES
Does exhaust
gas limit have
continuity?
Replace exhaust
gas limit switch:
FDXLEGL1930
NO

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