True Manufacturing Company Swing Glass Door Merchandiser Refrigerator GDM-26 - Manual (Page 8)

2001 East Terra Lane • O'Fallon, MO. 63366 • ph. 636.240.2400 • toll free 800. 325.6152 • [email protected]
GDM SERIES COOLER EQUIPPED WITH EMS (ELSTAT) CONTROL
NORMAL OPERATING CODES
Normal operating mode. Cabinet
should be holding proper product
temperature.
Units is in Standby mode. Control
will cycle the unit at a warmer
temperature. Lights will be off.
Units is in defrost . Compressor has
been shut off and evaporator fan
motor is running to clear any ice
that may have accumulated. This is a
predetermined program function.
Freeze up protection. This unit has
gone down below the minimum
temperature Set Point.
Possible Problems Action to take
Compressor not shutting off Check compressor. Relay at
controller
Faulty Probe Ohm out evaporator probe
Parameters have been
changed
Check parameter list
Refrigeration System Failure. The unit
has not satisfied the set point in the
amount of time allowed.
Possible Problems Action to take
Unit is not cooling Check the Refrigeration System
Faulty Probe Ohm out evaporator probe
Faulty Controller Bypass control to see if system will
run
Parameters have been
changed
Check the parameter list
Power supply voltage is low.
Possible Problems Action to take
Poor voltage at outlet Verify proper voltage to cabinet
Faulty Transformer Verify 120V to transformer. Check for
12V on secondary. Connector 7
(see page 2)
Faulty Controller Bypass control to see if system will run
Faulty Elstat If 12V is present at connector 7, replace
Elstat
Power supply voltage is too high.
Possible Problems Action to take
High voltage at outlet Verify proper voltage to cabinet
Faulty Transformer Verify 120V to transformer. Check for
12V on secondary. Connector 7
(see page 2)
Faulty Elstat If 12V is present at connector 7, replace
Elstat.
Probe failure
Possible Problems Action to take
Connector off at controller Verify that connector 4 is in place
(see page 2)
Probe is open Ohm out probe
Probe is shorted Ohm out probe
Probe wire is open Ohm out probe wire
Elstat Probes by the evaporator motor GDM-10 to 33 probes in air
stream GDM-35 to 72
Value Ohms
32° 32,000 Ohms
70° 12,000 Ohms
80° 9,300 Ohms
85° 8,500 Ohms
90° 7,000 Ohms
FAULT CODES/ TROUBLESHOOTING
8