NTI FTG 600 - Page 61

FTG │Installation & Operation Manual
61
Table 16-2 Troubleshooting Chart
PROBLEM
POSSIBLE CAUSE
CORRECTIVE ACTION
Lockout or Hold 88 – Outlet T
Rise limit
Insufficient water flow
See Lockout or Hold 81.
Hold 91– Inlet sensor fault
Sensor disconnected
Check sensor connection located on the bottom of
the heat exchanger. Check connection on control
board.
Faulty sensor
Check resistance of sensor and compare to
thermistor resistance chart, see Table 16-2.
Hold 92 – Outlet sensor fault
Sensor disconnected
Check sensor connection located on the top of the
heat exchanger. Check connection on control
board.
Faulty sensor
Check resistance of sensor and compare to
thermistor resistance chart, see Table 16-2. (Note
the Outlet sensor incorporates two sensors, check
resistance individually.)
Hold 95 – Stack sensor fault
Sensor disconnected
Check sensor connection located at the bottom of
the flue pipe inside the boiler cabinet. Check
connection on control board.
Hold 95 – Stack sensor fault
Faulty sensor
Check resistance of sensor and compare to
thermistor resistance chart, see Table 16-2. (Note
the Outlet sensor incorporates two sensors, check
resistance individually.)
Lockout 109 – Ignition failure
occurred
Spark cable disconnected
Ensure that the high voltage spark cable is securely
connected to the spark generator and the igniter
electrode. Check that the green ground wire is
securely attached to the ¼” quick connect tab on the
igniter electrode.
Blocked venting
Check for blockage of the exhaust-vent, air-inlet,
combustion blower, gas valve venturi, burner heat
exchanger etc.
Blocked condensate drain.
Clean condensate trap, inspect condensate drain for
blockages and build-up – correct accordingly.
Insufficient gas line pressure
Ensure the manual gas shutoff valve is open. Refer
to Section 9.0 GAS VALVE AND BURNER
SETUP.
Flame sensor disconnected
Verify that the flame rod signal wire is securely
attached to the flame rod and the Sola controller.
No 120VAC to Spark Generator
Check wiring from Sola controller to spark
generator. With an AC voltmeter measure voltage
across J5-6 and ground (the Sola controller chassis
is connected to the 120VAC supply ground) during
trial for ignition.
Faulty Spark Generator
During trial for ignition check for arc on spark
electrode via the observation port located next to the
spark electrode in the burner door. If the spark
generator is receiving 120VAC and no spark is
observed, replace the spark generator.
No 24VAC to Gas Valve
Check the wiring harness for loose or interrupted
connections of the gas valve wiring. With an AC
voltmeter, measure the voltage between Sola
controller terminals J5-2 to J4-10. There should be
24VAC present during trial for ignition, if not
replace Sola controller.