Lx Series Installation and Operation Instructions │Trinity Lx
69
Table 14-1 Troubleshooting Chart
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
Lockout 9 – Flame bias out of
range
4-20mA input being overdriven. If using 4-20mA input, check to ensure current is
not greater than 21mA.
Hold 27 – Flame rod shorted
to ground detected
A flame circuit shorted to ground
may show up as a flame circuit
timeout. Zero-ohm shorts can
display as Hold 27.
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.
Hold 61 – Anti short-cycle Demand off Check demand. Delay is to prevent rapid cycling
of burner.
Burner ignition Hold 62 is normally seen for a brief period prior
to burner ignition.
- Blower problem
- Faulty controller
If Hold 62 persists for 15 seconds or more, check
"Fan speed" on Touchscreen. If "LOW RPM",
"HIGH RPM" or rapidly changing RPM value is
displayed, try connecting another blower. If
problem remains, replace controller.
Hold 62 – Fan speed not
proved
Wiring defect Inspect blower wiring, ensure connectors at
controller and blower are securely attached.
Hold 63 – LCI OFF (Limit
control input)
Replacement control incorrectly
configured.
LCI must be set to “enable” on all Lx models,
excluding Lx150/150E units with a serial number
of 49351 or lower and Lx200/400 units with a
serial number of 48251 or lower. See instructions
included with replacement controller.
No problem, normal operation Hold 65 will normally be displayed momentarily
during the drive to light-off.
Blown fuse
Check Fuse
"A", blown fuse prevents blower
from operating.
Faulty blower If Fuse “A” is good and blower remains off, check
120VAC supply to blower, if present replace
blower. If blower is on proceed to next step.
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.
Faulty air switch If venting and air inlet are clear, temporarily
jumper the air switch. If the unit lights and
operates smoothly – replace air switch. If the unit
fails to light or lights but runs rough or abruptly
shuts down – check boiler internals for blockage.
WARNING Only jumper the air switch for
diagnosing purposes.
Hold 65 – Interrupted Air
Switch OFF
Incorrect air switch wiring Check that the red and orange wires are connected
to quick connect tabs 3 and 1 respectively.
Incorrect air switch setting Contact NTI technical support.
Incorrect air switch wiring Check that the red and orange wires are connected
to quick connect tabs 3 and 1 respectively.
Hold 66 – Interrupted air
switch ON (and blower is off)
Faulty air switch Disconnect red and orange wires from air switch
and check for open circuit between terminals 1 &
3. If continuity detected, replace air switch.
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