Lx Series Installation and Operation Instructions
│
Trinity Lx
85
Table 17-1 Troubleshooting Chart
PROBLEM
POSSIBLE CAUSE
CORRECTIVE ACTION
Hold 91– Inlet sensor fault
Sensor disconnected
Verify that 2-position Molex connector on
wiring harness is securely attached to mating
connector on inlet sensor.
Inspect sensor wiring.
Faulty sensor
Check resistance of sensor and compare to
thermistor resistance chart, see Table 17-2.
Hold 92 – Outlet sensor fault
Sensor disconnected
Verify that 4-position Molex connector on
wiring harness is securely attached to mating
connector on outlet sensor.
Inspect sensor wiring.
Faulty sensor
Check resistance of sensor and compare to
thermistor resistance chart, see Table 17-2.
Hold 95 – Stack sensor fault
Sensor disconnected
Verify that 4-position Molex connector on
wiring harness is securely attached to mating
connector on stack sensor.
Inspect sensor wiring.
Faulty sensor
Check resistance of sensor and compare to
thermistor resistance chart, see Table 17-2.
Lockout 109 – Ignition failure
occurred
(Lx500-800 only)
Or
Hold 110 – Ignition failure
occurred, failure to prove
flame after 3 ignition attempts
(Lx150-400 only)
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.
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 & CH
terminals. If using 4-20mA input, check to ensure
current is not greater than 21mA.
