Lx Series Installation and Operation Instructions │Trinity Lx
71
Table 14-1 Troubleshooting Chart
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
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.
Insufficient gas line pressure Ensure the manual gas shutoff valve is open.
Refer to manual section 9.0 GAS VALVE AND
BURNER SETUP.
Flame rod disconnected Verify that the flame rod signal wire is securely
attached to the flame rod, which is located bottom
center of the burner door.
No 120VAC to Spark Generator Check wiring from controller to spark generator.
With an AC voltmeter measure voltage across J5-
6 and ground (the 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 from controller
terminals J5-2 to J4-10. There should be 24VAC
present during trial for ignition.
Hold 110 – Ignition failure
occurred (failure to prove
flame after 3 ignition
attempts)
Faulty Gas Valve The gas valve emits an audible click when it
switches on or off. If the controller is providing
24VAC to the gas valve, and the wiring is intact,
it should be possible to detect if the valve is
responding.
Lockout 113 – Flame circuit
timeout
A flame circuit shorted to ground
may show up as a flame circuit
timeout. High resistance shorts can
display as Lockout 113.
Check to ensure condensate drain is not blocked.
Check to ensure no voltage applied to R & T
terminals. If using 4-20mA input, check to ensure
current is not greater than 21mA.
Blocked venting Check for blockage of the exhaust vent. Alert 128 - Modulation rate
was limited due to IAS was
open (Air switch open while
burner firing)
Blocked air inlet Check for blockage of the air inlet.
Outdoor sensor not connected The Trinity Lx is factory set with Outdoor Reset
enabled. Connect outdoor sensor or disable
Outdoor Reset.
Outdoor sensor wiring Check wiring of outdoor sensor. Wires should
connect to Low Voltage barrier terminals 11 & 12.
Alert 248 – CH outdoor
temperature was invalid
Faulty sensor Check sensor. Should be free of ice and snow.
Check resistance of sensor and compare to
thermistor resistance chart, see Table 14-2.
Blocked venting Check for blockage of the exhaust vent.
Blocked air inlet Check for blockage of the air inlet.
Disconnected, damaged or blocked
tubing
Inspect the clear vinyl tubing connecting the air
switch + and – ports to the air metering elbow.
Condensation or other foreign matter may be
obstructing the tubing, preventing the switch from
sensing differential pressure caused by air flow
through the metering elbow.
Incorrect air switch setting Contact NTI technical support.
Alert 311 – Run was
terminated due to interrupted
air flow switch was off
Blown fuse
Check Fuse
"A".
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