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2001 East Terra Lane • O'Fallon, MO. 63366 • ph. 636.240.2400 • toll free 800. 325.6152 • service@truemfg.com
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
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2001 East Terra Lane • O'Fallon, MO. 63366 • ph. 636.240.2400 • toll free 800. 325.6152 • service@truemfg.com
TROUBLESHOOTING GUIDE
(Please note this does not cover any and all situations)
Complaint
True Manufacturing Company
Possible Cause
Repair
Cabinet not cold enough
1. No product in cabinet.
1. Load cabinet Elstat is
equipped with a anti-short
cycle that can make the unit
run warm with no product.
2. Unit in a unpredictable
location. Elstat control may be
going in standby mode.
2. Move cabinet or put into
Perishable mode.
3. Unit was in a previous
location.
3. Perform half reset.
Warm Product
1. Unit in a unpredictable
location. Elstat control may be
going into standby mode.
1. Move cabinet or put into
Perishable mode.
2. Compressor not running.
2. Check for out put voltage
at controller. If good follow
compressor diagnosis.
3. Compressor running.
3. Follow refrigeration trouble
shooting guides.
4. Unit in standby mode.
Unit displaying a
temperature instead of
“use.”
1. Unit recently worked
on. Parameters have been
changed.
1. Reset the DIS parameter to
“0”.
GDM SERIES COOLER EQUIPPED WITH EMS (ELSTAT) CONTROL
TROUBLESHOOTING GUIDE
9