
H B X S N O - 0 5 5 0 S n o w M e l t C o n t r o l
V e r s i o n 2 . 1 4 . 1
© HBX Control Systems Inc. 2020
Page 21
For additional assistance with the SNO-0550, please contact our
Technical Support Department toll free at:
+1 (855) 410-2341
TESTING AND TROUBLESHOOTING PROCEDURE
Temperature
Resistance
Temperature
Resistance
Temperature
Resistance
º
F
º
C
Ω
º
F
º
C
Ω
º
F
º
C
Ω
- 22
- 30
177,000
- 0.4
- 18
86,463
21.2
- 6
44,617
- 18.4 - 28
156,404
3.2
- 16
77,162
24.8
- 4
40,153
- 14.8 - 26
138,482
6.8
- 14
68,957
28.4
- 2
36,182
- 11.2 - 24
122,807
10.4
- 12
61,711
32
0
32,654
- 7.6
- 22
109,075
14
- 10
55,319
35.6
2
29,498
- 4
- 20
97,060
17.6
- 8
49,640
39.2
4
26,686
SN0-0550 / SNO-0110 - Testing
1.
Thermistor Test
Resistance table for thermistors (outdoor, system)
2.
Snowmelt Sensor Test
I. To test the sensor, ensure that the control is in Demand type: Force Melt, and also not in CWSD or
WWSD. Put some water or snow on the sensor, and move it around with your hand or a cloth for about
30 seconds to 1 minute. This will trigger a Melt and the control will go through the Melt cycle.
II. Control Info, acceptable parameters for the SNO-0110 Optical Sensor. Control Info is found in the
TESTING menu.
Type
Acceptable Parameters
Voltage
11 – 15 VDC
Current
0.585 – 0.599 A
Resistance
19 – 24 OHMS
SENSOR ERRORS
HTR-LOWC: Low current is being drawn into the sensor and will not sense snow. Check the wiring of
the control. Refer to testing procedure above, and inspect the SNO-0110 Sensor for signs of damage
or improper drainage.
Reset control when issue has been corrected to eliminate error code.
HTR-FAULT
: High current is being drawn into the sensor and will not sense snow. Screen will flash
orange, and fuse in control will trip. Check the wiring of the control. Refer to testing procedure above,
and inspect the SNO-0110 Sensor for signs of damage or improper drainage.
Reset control when issue has been corrected to eliminate error code.