P/N 474131 Rev. M 8/2020 MasterTemp Pool and Spa Heater
51
Section 3. Troubleshooting
IGN is ON
Verify connection to HSI igniter,
HSI is not broken, flame current status.
YES
NO
Gas flow during ignition and
burner fire for less than 7 seconds.
Gas flow during ignition try,
but burner does not fire.
Check gas pressure. Ok?
YES
Check voltage across igniter
leads, ok?
YES
NO
Replace HSI igniter
YES
NO
NO
Increase gas flow into heater:
• Replace gas line. with larger line.
• Replace regulator
• Replace meter, or
• All of the above.
Replace ignition control module.
On a 120 V installation check the
ignitor for damage if it has seen
240 VAC.
Replace Control board.
NO
Did blower come on?
YES
YES
Verify that gas supply is open all
the way to Gas Valve, and Gas
Valve is set at “on” position.
Check for 24 VAC to Gas Valve
terminals during ignition try.
(Voltage appears about 24 seconds
after call for heat). SEE NOTE 2
Verify that gas is flowing to burner
during ignition try. Observe gas
meter for movement during ignition
try (wait for about 30 seconds after
calling for heat)
Replace Gas Valve
with identical part.
NO
NO
Check for 24 VAC between
TH and GND terminals on
Ignition Control Module.
SEE NOTE 1
Check for 24 VAC between
TH and GND terminals on
Control Board. SEE NOTE 1
NO
NO Replace Control
Board.
YES
Fix wiring between TH and
GND terminals of ignition
Control Module and Control Board.
YES
Check for 24 VAC between
VAL and GND terminals on
ignition Control Module.
SEE NOTE 2
Replace ignition
Control Board.
NO
Check for 24 VAC between
VAL and GND terminals on
Control board.
SEE NOTE 2
YES Check for 24 VAC between
GAS terminals on Control
Boards. SEE NOTE 2.
Fix wiring between GAS
terminals on Control Board
and Gas Valve.
YES
Fix wiring between VAL and
GND terminals of Ignition
Control Module and
Control Board.
Replace Control
board.
NO
NO
YES
Verify connection to HSI igniter,
HSI is not broken, flame current
status.
YES
NOTE 1:Voltage appears immediately after call for
heat, and may be on for only about 30 seconds.
NOTE 2: Voltage appears about 24 seconds after
call for heat, and may be on for only about 7 seconds.
ALARMS: AGS, AFS, HLS, PS, E01 or 126
