If" Code - Hayward H150FDN Troubleshooting Manual

12. Service LED ON: "IF" Code

"IF" Code

YES
Is main gas
supply ON?
NO
Turn on main
gas supply &
retest
YES
Go to
section B
(next page)
52
YES
Inspect gas
valve in heater
Test 22-28VAC to
YES
Is there
manifold gas
pressure?
NO
YES
Is heater's gas
valve ON?
NO
Turn ON gas
valve and retest
YES
gas valve during
call for heat
(manometer
attached)
Is voltage
correct?
NO
Replace gas
valve:
Please refer to
(pg. 20)
On ICB, verify flame
sensor & gas valve
connections are
secure
YES
Is inlet and
manifold gas
pressure correct?
NO
Is inlet
YES
pressure
correct?
NO
Correct inlet
gas pressure
Replace ICB:
FDXLICB1930
Are
connections
secure?
NO
Secure
connections
& retest
Adjust
manifold gas
pressure