NTI Trinity Lx 150 - Page 70

Trinity Lx │Installation and Operation Instructions Lx Series
70
Table 14-1 Troubleshooting Chart
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
Hold 66 – Interrupted air
switch ON (and blower is on)
- Blower problem
- Faulty controller
Check low voltage wiring from blower to
controller. Check VDC signal from red–green
and black-green; if not 28-32VDC and 0 VDC
respectfully – replace controller. If signal is
correct – replace blower.
Insufficient water pressure Ensure at least 15PSI at appliance outlet. Refer to
Supplementary Documentation section 2.0 System
Piping.
Hold 67 – ILK OFF
External Limit Tripped Indication that an external limit (wired to “LIM”)
is open. Not a problem with boiler, check
external limit.
CH or DHW settings Check if CH and/or DHW set point temperature
plus off hysteresis exceeds 210°F (99°C).
Hold 79 – Outlet High Limit
CH or DHW pump problem
See
"Inoperative CH or DHW pump" below.
Lockout 81 – Delta T limit
OR
Appliance making banging or
hissing sounds
Insufficient water flow
• Check Fuse "A"
• Check appliance pump.
• Ensure plumbing is correct. Refer to
Supplementary Documentation section 2.0
System Piping. Check that water pressure is at
least 15PSI.
• Boilers Only - Boiler heat transfer surfaces
may be fouled with scale or magnetite. Clean
with Fernox DS-40 Descaler and Cleanser. See
Table 2-1 in Appendix B.
Dirty heat exchanger Inspect and if required clean the combustion
chamber and/or heat exchanger. Refer to 14.0
Annual Manintenance and Inspection and
Supplementary Documentation section 2.0 System
Piping.
Lockout 82 – Stack limit
Faulty sensor Check resistance of stack sensor and compare to
thermistor resistance chart, see Table 14-2.
Lockout 85 – Inlet/Outlet
Inversion Limit
Pump flowing in the wrong
direction
Ensure water circulation is flowing into the boiler
at the fitting closest to the wall.
Lockout 88 – Outlet T Rise
limit
Insufficient water flow See Lockout 81.
Sensor disconnected
• Verify that 2-position Molex connector on
wiring harness is securely attached to mating
connector on inlet sensor.
• Inspect sensor wiring.
Hold 91– Inlet sensor fault
Faulty sensor Check resistance of sensor and compare to
thermistor resistance chart, see Table 14-2.
Sensor disconnected
• Verify that 4-position Molex connector on
wiring harness is securely attached to mating
connector on outlet sensor.
• Inspect sensor wiring.
Hold 92 – Outlet sensor fault
Faulty sensor Check resistance of sensor and compare to
thermistor resistance chart, see Table 14-2.
Sensor disconnected
• Verify that 4-position Molex connector on
wiring harness is securely attached to mating
connector on stack sensor.
• Inspect sensor wiring.
Hold 95 – Stack sensor fault
Faulty sensor Check resistance of sensor and compare to
thermistor resistance char
t
, see Table 14-2.