Hayward H150 Installation, Operation And Service Manual page 41

Troubleshooting Chart:
CODE FAULT
BO Bypass Operation
IF Ignition Failure
Temperature Sensor
SF
Input Failure
Maximum Return
HS Water Temperature
Exceeded
HF Flame Sense Fault
H-SERIES HEATER DIAGNOSTIC GUIDE
DIAGNOSIS STEP
1. Check state of #2 dip
switch on back of control
module.
1. Ensure gas supply shutoff
valves are open.
2. Check for low gas supply
pressure.
3. Check for faulty igniter wir-
ing or connection.
4. Check for faulty gas valve
wiring or connection.
5. Check for gas valve failure
or gas valve relay failure.
1. Check for faulty wiring or
connection.
2. Sensor is defective.
1. Pool water temperature
exceeds 104ºF.
2. Verify that water flow is
adequate.
1. Flame sense failure.
SECTION 7. TROUBLESHOOTING
This is a normal display when heater is being controlled by a remote ther-
mostat. No service is required. If heater is not being controlled by remote
thermostat, change setting of #2 dip switch to "Off" position.
Ensure that main gas shutoff installed adjacent to heater is open. Ensure
that knob on gas valve inside unit is in "On" position. If OK, proceed to
step 2.
Ensure inlet gas supply pressure exceeds minimum value indicated on
rating plate. If OK, proceed to step 3.
Inspect igniter wiring. Ensure igniter plug is securely plugged into back of
control module. If OK, proceed to step 4.
Inspect gas valve wiring. Ensure wire harness terminals are securely
fastened to spade terminals on gas valve. If OK, proceed to step 5.
1. Measure voltage across gas valve during trial for ignition. If 24 vac is
present and gas valve does not open, gas valve is defective. Replace
gas valve.
2. If 24 vac is not present, gas valve relay on control module is defective.
Replace control module.
Inspect sensor wiring. Ensure sensor is plugged into back of control
module. If OK, proceed to step 2.
Replace temperature sensor.
Verify set point setting of remote thermostat is at or below 104ºF. If set
point setting of remote thermostat is OK, or if heater is not configured for
remote thermostat proceed to step 2.
Verify that water flow rate to heater is above minimum required.
Replace igniter.
REMEDY
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