Warning:
Performance and reliability issues that result from the controller parameters being changed from
the factory default settings are not covered under warranty.
Controller error codes:
➢
P1- Room Probe Failure
•
Check to make sure the probe is connected to the controller
•
Check the probe resistance (see “Checking the probe resistance” below)
➢
P2- Evaporator Probe Failure
•
This error should only occur on MFV units. Verify that the unit is an MFV model.
•
Check to make sure the probe is connected to the controller
•
Check the probe resistance (see “Checking the probe resistance” below)
➢
dF- Indicates that the unit is in defrost
•
Normal Scheduled defrosts can last up to 20 minutes at the factory default values
•
If abnormal defrosts are suspected see “Resetting the program to factory default settings” below
➢
HA- Maximum Temperature Alarm
•
The box temperature has exceeded the 75° maximum for more than 30 minutes
•
See diagnostic flow charts below
➢
LA- Minimum Temperature Alarm
•
The box temperature has deceeded the 25° minimum (-15° for MFV) for more than 30 minutes
•
See diagnostic flow charts below
Checking the controller set point:
➢
Press the set button once to display the controller set point. Press again to return to the temp display.
Changing the controller set point:
➢
Hold the SET key for 3 seconds, release, and use the arrow keys to change the set point. The set point can be
changed from 33° to 65° on coolers and 0° to 28° on MFV's
•
Factory Default set points are as follows: MFV 10°, Beer 34°, White Wine 50°, Red Wine 60°
•
There is a 5° (8° for MFV) differential between cut in and cut out temps. If the controller set point is 35°
the range will be 35° to 40°. (MFV controller set point 10°, range will be 10° to 18°)
Checking the probe resistance:
➢
Verify the probe resistance is accurate at the box temperature
•
Use a calibrated thermometer to check the cooler's temperature at the evap inlet where the probe is located
•
Disconnect the probe from the controller
•
Use a calibrated Ohm meter to measure the resistance of the probe at the box temperature
•
The resistance of the probe should match the associated box temperature of the following table
➢
Fill a cup full of ice water (use a lot of ice), put the probe into the ice bath, stir for 1 minute, then measure the
resistance with a calibrated Ohm meter. Make sure to keep the probe in the center of the cup.
•
The probe should have 27,280 Ohms of resistance in the ice bath. Replace the probe if it is not within 2
degrees Ohms range from Table 1 above.
F-755-028
Rev. E
9/16/16
Table 1
Temp Deg F
Temp Deg F
Temp Deg F
Temp Deg F
Temp Deg F
-4
67770
22
34852
42
21596
64
13246
86
8313
-2
64579
23
33900
44
20687
66
12668
88
8008
0
61388
24
33164
46
19778
68
12090
90
7703
2
58197
26
31693
48
18869
70
11626
92
7398
5
53410
28
30222
50
17960
72
11161
94
7093
8
49763
30
28751
52
17233
74
10697
95
6940
10
47332
32 (Ice Water)
27280
54
16507
76
10232
96
6816
12
44901
34
26118
56
15780
77
10000
98
6569
14
42470
36
24956
58
15053
78
9813
100
6322
16
40566
38
23793
59
14690
80
9438
102
6074
18
38661
40
22631
60
14401
82
9063
104
5827
Ohms
Resistance
Ohms
Resistance
Ohms
Resistance
Ohms
Resistance
Ohms
Resistance
