Hayward H150FDN All models English - Page 41

Troubleshooting Chart

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SECTION 7. TROUBLESHOOTING Troubleshooting Chart: CODE BO IF SF HS HF H-SERIES HEATER DIAGNOSTIC GUIDE FAULT DIAGNOSIS STEP REMEDY Bypass Operation 1. Check state of #2 dip switch on back of control module. This is a normal display when heater is being controlled by a remote thermostat. No service is required. If heater is not being controlled by remote thermostat, change setting of #2 dip switch to "Off" position. 1. Ensure gas supply shutoff valves are open. 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. 2. Check for low gas supply pressure. Ensure inlet gas supply pressure exceeds minimum value indicated on rating plate. If OK, proceed to step 3. Ignition Failure 3. Check for faulty igniter wiring or connection. 4. Check for faulty gas valve wiring or connection. 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. 5. Check for gas valve failure or gas valve relay failure. 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. Temperature Sensor Input Failure 1. Check for faulty wiring or connection. 2. Sensor is defective. Inspect sensor wiring. Ensure sensor is plugged into back of control module. If OK, proceed to step 2. Replace temperature sensor. Maximum Return Water Temperature Exceeded 1. Pool water temperature exceeds 104ºF. 2. Verify that water flow is adequate. 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. Flame Sense Fault 1. Flame sense failure. Replace igniter. 39

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39
SECTION 7.
TROUBLESHOOTING
Troubleshooting Chart:
H-SERIES HEATER DIAGNOSTIC GUIDE
CODE
FAULT
DIAGNOSIS STEP
REMEDY
BO
Bypass Operation
1. Check state of #2 dip
switch on back of control
module.
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.
IF
Ignition Failure
1. Ensure gas supply shutoff
valves are open.
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.
2. Check for low gas supply
pressure.
Ensure inlet gas supply pressure exceeds minimum value indicated on
rating plate. If OK, proceed to step 3.
3. Check for faulty igniter wir
-
ing or connection.
Inspect igniter wiring. Ensure igniter plug is securely plugged into back of
control module. If OK, proceed to step 4.
4. Check for faulty gas valve
wiring or connection.
Inspect gas valve wiring. Ensure wire harness terminals are securely
fastened to spade terminals on gas valve. If OK, proceed to step 5.
5. Check for gas valve failure
or gas valve relay failure.
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.
SF
Temperature Sensor
Input Failure
1. Check for faulty wiring or
connection.
Inspect sensor wiring. Ensure sensor is plugged into back of control
module. If OK, proceed to step 2.
2. Sensor is defective.
Replace temperature sensor.
HS
Maximum Return
Water Temperature
Exceeded
1. Pool water temperature
exceeds 104ºF.
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.
2. Verify that water flow is
adequate.
Verify that water flow rate to heater is above minimum required.
HF
Flame Sense Fault
1. Flame sense failure.
Replace igniter.