Table 9 — System Fault Codes
NO. OF QUICK
LED FLASHES
SYSTEM FAULT
2 Room Air Thermistor
3 Indoor Coil Thermistor
4 Outdoor Coil Thermistor*
5 Compressor Malfunction
6 Reversing Valve Malfunction*
7 Outdoor Air Thermistor*
8 Indoor Fan Failure
9 Discharge Air Thermistor
LED — Light-Emitting Diode
*Heat pump systems only.
NOTE: If the LED light continuously flashes on for one second, then
off for one second, the control is functioning properly and no fault is present.
Table 10 — 619E Thermistor Properties*
TEMP
(F)
MINIMUM
OHMS
NOMINAL
OHMS
MAXIMUM
OHMS
MINIMUM
THERMISTOR
VOLTS — DC
NOMINAL
THERMISTOR
VOLTS — DC
MAXIMUM
THERMISTOR
VOLTS — DC
−40 303,300 342,700 386,200 4.80 4.82 4.84
−30 211,500 237,276 265,444 4.72 4.75 4.77
−20 149,721 166,689 185,146 4.61 4.65 4.68
−10 107,379 118,776 130,973 4.48 4.52 4.55
0 77,281 85,677 93,867 4.30 4.35 4.40
10 56,567 62,617 68,205 4.09 4.16 4.21
20 42,661 46,302 50,129 3.86 3.92 3.98
30 32,043 34,580 37,220 3.59 3.66 3.72
32 30,300 32,550 35,120 3.53 3.60 3.66
40 24,061 26,118 27,960 3.28 3.36 3.43
50 18,650 19,900 21,180 2.99 3.05 3.11
60 14,402 15,312 16,219 2.67 2.73 2.79
70 11,247 11,883 12,518 2.36 2.42 2.47
80 8,820 9,299 9,779 2.06 2.11 2.16
90 6,846 7,339 7,754 1.76 1.83 1.88
100 5,487 5,829 6,187 1.52 1.57 1.63
110 4,367 4,667 4,976 1.29 1.34 1.40
120 3,502 3,760 4,026 1.09 1.14 1.19
130 2,830 3,051 3,281 0.92 0.97 1.02
140 2,300 2,489 2,687 0.77 0.82 0.87
150 1,880 2,045 2,216 0.65 0.69 0.74
160 1,547 1,688 1,836 0.55 0.59 0.63
170 1,280 1,402 1,531 0.46 0.50 0.53
180 1,065 1,170 1,282 0.39 0.42 0.45
190 890 982 1,078 0.33 0.36 0.39
200 748 828 913 0.28 0.31 0.33
210 631 701 766 0.24 0.26 0.28
212 611 678 751 0.23 0.25 0.28
*Circuit volts = 5 vdc.
—19—
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