Hayward H400FDN Universal H Series Troubleshooting Guide - Page 22

Heater Not Powering Up cont.

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1. Heater Not Powering Up (cont.) Section B (continued from previous page) Inspect wires & YES connections, are they OK? NO Secure wiring/plugs and retest Disconnect and test the red & grey wires on ICB for 22-28VAC. Is voltage YES correct? NO Replace wire harness: FDXLWHA1930 Replace display/ bezel/keypad: (See Pg. 20) Replace fuse: FDXLFSK1930 then go to section 3. YES Is fuse blown? NO On ICB, test 3A fuse for continuity YES Is voltage correct? NO On the ICB, verify 22-28VAC between AC & COM (pins 1&4) Replace the ICB: FDXLICB1930

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1. Heater Not Powering Up (cont.)
YES
NO
Inspect wires &
connections,
are they OK?
Disconnect and
test the red &
grey wires on ICB
for 22-28VAC.
YES
Replace wire
harness:
FDXLWHA1930
Section B
(continued from
previous page)
Secure
wiring/plugs
and retest
Is voltage
correct?
NO
On ICB, test 3A
fuse for
continuity
Is fuse
blown?
NO
YES
On the ICB, verify
22-28VAC
between AC &
COM (pins 1&4)
Replace fuse:
FDXLFSK1930
then go to
section 3
.
Is voltage
correct?
Replace the ICB:
FDXLICB1930
Replace display/
bezel/keypad:
(See Pg. 20)
NO
YES