ARP Control v5.x Troubleshooting Guide 0 © 2013-2020 ARPC L.L.C. All rights reserved. 21
04/20/202
ARP Control before leaving on a trip, the ARP Control troubleshooting features can help solve
any issues before you leave.
12.4 Get Fridge Ready for Travel
We like to freeze two gallons of water in our household freezer to speed up our departure
when we go camping. After the dry run of checking the engine and charging system, make
sure there is enough voltage to run your fridge, start the fridge on either LP Gas or shore
power. Place a gallon of frozen water in both the refrigerated and freezer spaces and shut the
door. This reduces the time to about 4 hours of running the fridge before driving. Load the
fridge with pre-chilled food; we like to put frozen food in our fridge to thaw out for our first or
second night meal to help the fridge while driving. Your fridge does cool while driving, but just
not as well as when the fridge is stationary.
RTD TROUBLESHOOTING
13.1 Check Boiler Sensor
Start by turning off the ARP Control by
disconnecting the ARP red wire. Each of the Ω1,
Ω2, Ω3,…is a representation of using a multi-
meter to measure the resistance either between
the two wires or from the respective wire to the
ground. Please note that the color code of the
wire has no meaning because there is no polarity
for the temperature sensor. Thus, Ω2 or Ω3
maybe either the white or purple wire.
Ω1 ≈ 2.2M
Ω2 ≈ 2.2M or 1k
Ω3 ≈ 2.2M or 1k
Ω4 = OPEN or OL on typical multi-meter
Ω5 ≈ Use RTD Table to determine this value.
Ω6 = OPEN or OL on typical multi-meter.
See 2.9 SHt
for more RTD wiring info.
13.2 SHt Error
The most common causes of the SHt error is the
sensor wire rubbing on the sheet metal boiler
housing. Where the sensor wire exits the boiler
housing insulation can be used to keep the wire
from rubbing on the sheet metal housing.
RTD TABLES
Temp.
(ºC)
Temp.
(ºF)
ARP
RTD
(Ω)
1 33.8 1003.9
2 35.6 1007.8
3 37.4 1011.7
4 39.2 1015.6
5 41.0 1019.5
6 42.8 1023.4
7 44.6 1027.3
8 46.4 1031.2
9 48.2 1035.1
10 50.0 1039.0
11 51.8 1042.9
12 53.6 1046.8
13 55.4 1050.7
14 57.2 1054.6
15 59.0 1058.5
16 60.8 1062.4
17 62.6 1066.3
18 64.4 1070.2
19 66.2 1074.0
20 68.0 1077.9
21 69.8 1081.8
22 71.6 1085.7
23 73.4 1089.6
24 75.2 1093.5
25 77.0 1097.3
26 78.8 1101.2
27 80.6 1105.1
28 82.4 1109.0
29 84.2 1112.9
30 86.0 1116.7
31 87.8 1120.6
32 89.6 1124.5
33 91.4 1128.3
34 93.2 1132.2
35 95.0 1136.1
36 96.8 1140.0
37 98.6 1143.8
38 100.4 1147.7
39 102.2 1151.5
40 104.0 1155.4
41 105.8 1159.3
42 107.6 1163.1
43 109.4 1167.0
44 111.2 1170.8
45 113.0 1174.7
46 114.8 1178.6
47 116.6 1182.4
48 118.4 1186.3
49 120.2 1190.1
50 122.0 1194.0
51 123.8 1197.8
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