NTI Trinity Lx150 - Page 87

Lx Series Installation and Operation Instructions │Trinity Lx
87
Table 17-1 Troubleshooting Chart
PROBLEM
POSSIBLE CAUSE
CORRECTIVE ACTION
Blower operating at high
speed while burner off
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 not operating
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 boiler pump.
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 17-2 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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Table 17-3 Hold and Lockout Codes
Code
Description
Note
0
None
Hold / No lockout
1
Unconfigured safety data
Lockout
2
Waiting for safety data verification
Lockout
3
Internal fault: Hardware fault
Hold
4
Internal fault: Safety Relay key feedback error
Hold
5
Internal fault: Unstable power (DCDC) output
Hold
6
Internal fault: Invalid processor clock
Hold
7
Internal fault: Safety relay drive error
Hold