Ts Series Installation and Operation Instructions │Trinity Ts
55
Table 16-1 Troubleshooting Chart
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
Hold 63 – LCI OFF (Limit
control input)
Insufficient water pressure Ensure pressure is at or above 15PSI; if problem
persists after exceeding 20PSI – replace low water
pressure switch (PN:83223-1)
Faulty blower If blower remains off after the lockout is cleared,
check 120VAC supply to blower, if present
replace blower.
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.
Lockout 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.
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.
Lockout 67 – ILK OFF External Limit Tripped Indication that an external limit (wired to “LIM”)
had opened. Not a problem with boiler.
High Central Heat or DHW set
point.
Reduce Central Heat and DHW set points. Hold 79 – Outlet High Limit
Insufficient water flow or pressure
See
lockout 81 below.
Lockout 81 – Delta T limit
OR
Boiler making banging or
hissing sounds
Insufficient water flow
• Check boiler pump.
• Ensure plumbing is correct. Check that water
pressure is at least 15PSI.
• Boiler heat transfer surfaces may be fouled
with scale or magnetite. Clean with Fernox
DS-40 Descaler and Cleanser. See Table 10-1.
Dirty heat exchanger Inspect and if required clean the combustion
chamber and/or heat exchanger. Refer to Section
15.0 Annual Maintenance and Inspection.
Lockout 82 – Stack limit
Faulty sensor Check resistance of stack sensor and compare to
thermistor resistance chart, see Table 16-2.
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.
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