Trinity Lx │Installation and Operation Instructions Lx Series
72
Table 14-1 Troubleshooting Chart
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
Blown fuse
Check Fuse "B".
Faulty controller If Fuse “B” not blown, and controller is operating,
navigate to pump diagnostic on display. Manually
switch pump on, check for 120VAC at pump
connection terminal on line voltage barrier strip. If
120VAC not detected, replace controller.
Inoperative CH and/or DHW
pump
Faulty pump If 120VAC supplied to pump, and pump does not
operate, replace pump.
Blower signal cable disconnected
• Verify that the 5-position Molex connector on
the wiring harness is securely connected to its
mating connector on the blower.
• Check that the 4-position Molex connector on
wiring harness is securely connected to its
mating connector on the controller.
Blower operating at high
speed while burner off
No 24VAC to controller
• Check Power LED on controller.
• Check Fuse "C".
• With an AC voltmeter measure voltage at
terminals J8 1 & 2, 24VAC should be present.
Blower signal cable disconnected Verify that the 5-position Molex connector on the
wiring harness is securely connected to its mating
connector on the blower.
Blower power disconnected Verify that the 3-position Molex connector on the
wiring harness is securely connected to its mating
connector on the blower.
Blown fuse
Check Fuse "A" using the procedure described
above. Fuse "A" protects the blower as well as the
ignition spark generator and appliance pump.
Blower not operating
Faulty blower Measure voltage across pins 1 & 2 (black and
white wires) of 3-position connector on wiring
harness. If 120VAC detected, replace power
connector and remove 5-position signal connector.
Blower should rotate at high speed. If blower does
not rotate, replace blower.
Table 14-2 Thermistor Resistance vs. Temperature
Temp °F (°C) Resistance Ohms (Ω) Temp °F (°C) Resistance Ohms (Ω)
-22 (-30) 176,133 122 (50) 3,603
-4 (-20) 96,761 131 (55) 2,986
14 (-10) 55,218 140 (60) 2,488
32 (0) 32,650 149 (65) 2,083
41 (5) 25,390 158 (70) 1,752
50 (10) 19,900 167 (75) 1,481
59 (15) 15,710 176 (80) 1,258
68 (20) 12,490 185 (85) 1,072
77 (25) 10,000 194 (90) 918
86 (30) 8,057 203 (95) 789
95 (35) 6,531 212 (100) 680
104 (40) 5,327 230 (110) 506
113 (45) 4,369 - -
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