Hayward H400FDN Universal H Series Troubleshooting Guide - Page 46

Service LED ON: LO Code

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

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“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