NTI Trinity Tft399 Installation And Operation Manual page 68

│Installation and Operation Instructions
Trinity
Table 16-1 Troubleshooting Chart
PROBLEM
Hold 91– Inlet sensor fault
Hold 92 – Outlet sensor fault
Hold 95 – Stack sensor fault
Hold 95 – Stack sensor fault
Lockout 109 or Hold 110 –
Ignition failure occurred
(failure to prove flame after 3
ignition attempts)
68
POSSIBLE CAUSE
Faulty sensor
Sensor disconnected
Faulty sensor
Sensor disconnected
Faulty sensor
Incorrect spark igniter gap or faulty
spark igniter
Spark cable disconnected
Blocked venting
Blocked condensate drain.
Insufficient gas line pressure
Flame rod disconnected
No 120VAC to Spark Generator
Faulty Spark Generator
No 24VAC to Gas Valve
Faulty Gas Valve
CORRECTIVE ACTION
Check resistance of sensor and compare to
thermistor resistance chart, see Table 16-2.
Check sensor connection located on the top of the
heat exchanger. Check connection on control
board.
Check resistance of sensor and compare to
thermistor resistance chart, see Table 16-2. (Note
the Outlet sensor incorporates two sensors, check
resistance individually.)
Check sensor connection located at the bottom of
the flue pipe inside the boiler cabinet. Check
connection on control board.
Check resistance of sensor and compare to
thermistor resistance chart, see Table 16-2. (Note
the Outlet sensor incorporates two sensors, check
resistance individually.)
Check spark igniter gap – gap between electrodes
should be 3/16 to 1/4 inch.
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.
Check for blockage of the exhaust-vent, air-inlet,
combustion blower, gas valve Venturi, burner heat
exchanger etc.
Clean condensate trap, inspect condensate drain
for blockages and build-up – correct accordingly.
Ensure the manual gas shutoff valve is open.
Refer to Section 9.0 GAS VALVE AND
BURNER SETUP.
Verify that the flame rod signal wire is securely
attached to the flame rod and the Sola controller.
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.
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.
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.
The gas valve emits an audible click when it
switches on or off. If the Sola controller is
providing 24VAC to the gas valve, and the wiring
is intact, it should be possible to detect if the valve
is responding.
Tft Series