Hayward 150 - TROUBLESHOOTING LOOKUP CHART (cont.); Exhaust Gas Temp. Limit Fault Diagnosis; Temp. Sensor Failure Error Diagnosis

48 USE ONLY GENUINE REPLACEMENT PARTS
51300004201B
Table17: Troubleshooting Lookup Chart
Code/ Fault
Diagnostic Step
Suggested Troubleshooting Action
LO
displayed
Exhaust Gas
Temp. Limit
Fault cont…
1. Check for faulty
wiring or connection
Inspect temperature limit switch wiring. Ensure wire harness terminals are
securely fastened to spade terminals on temperature limit switch located in
the flue collector panel above the center of the header. If OK, proceed to
step 2.
2. Verify state of
temperature limit’s
contacts
Remove wire leads from limit switch and measure continuity across limit
switch contacts. If closed, LO code is not caused by exhaust gas
temperature limit switch fault. If open, proceed to step 3.
3. Heat exchanger
has been damaged
This is generally due to low water flow, poor water chemistry, or other
factors. Correct issues with water flow through the heater and water
chemistry and then replace the heat exchanger and exhaust gas
temperature limit. Continuing to run the heater after this limit has tripped
will cause damage to the entire unit and will not be covered by the
warranty.
PF
displayed
1. Polarity reversed
Reverse L and N (120vac) or L1 and L2 (240VAC).
2. Insufficient
ground continuity
Check for proper ground to unit and at service disconnect box
3. Low voltage
detected
Check that proper Voltage Selector Plug is installed.
4. Ignition control
board damaged
Sb
displayed
1. Keypad stuck
button error, keypad
is defective
Replace Display Interface Assembly.
SF
displayed
Temp. sensor
failure error
1. Check for faulty
wiring or
connection.
Inspect sensor wiring. Ensure sensor is plugged into back of ignition control
board. If OK, proceed to step 2.
2. Sensor is
defective
Replace temperature sensor.
WARNING: Pool heaters are heat producing appliances. To avoid possible over heating of the outer jacket and damage
or injury with such an event: (1) no materials should be stored against the jacket and (2) care should be taken to avoid
unnecessary contact (especially by children) with the jacket.
WARNING: When lighting a gas heater, the lighting instructions must be followed exactly to prevent “flashback” of
excess gas in the heater. Electronic ignition heaters and electric heaters must have the power shut off when making
adjustments for servicing, or coming into contact with the heater.
WARNING: UNDER NO CIRCUMSTANCES SHOULD FLAMMABLE MATERIALS, SUCH AS GASOLINE OR PAINT
THINNERS, BE USED OR STORED IN THE VICINITY OF THE HEATER OR IN ANY LOCATION FROM WHICH FUMES
COULD REACH THE HEATER.