Garland GI-MO/DU 7000, Service Manual

Page: 12 / 20

Part # 4526029 (02/22/11) Page 12
Problem Possible Cause Measure
Code No. No No W
No. Operation lamp and error lamp “OFF”
S25
Unit does not heat, no
reaction, contactor does
not work
U250
Building’s power fuses
defective, error on
electrical transmission
M201 Check mains supply L
U251
Error on operational
control
M251 Check operational control L
S26
Building fuses blow when
unit is switched on
U241 Short circuit in generator M241
Repair or replace
generator
L
S27
Some cooking platforms
do not heat
U271 Generator defective M241
Repair or replace
generator
L
S28
Unit does not heat, no
reaction, no contactor
U13
Error on DIP-Switch-
adjustment on CPU
M13
Check DIP-Switch
adjustment
L
Legend: W = Who should complete “Measure” E = End user L = Supplier
Repair Of Problems
Measure Activity Comment
M10 • Compare on another cooking platform and with an induction
type pan Check if the pan is appropriate to
induction cooking or not: use a
magnet.
M11 • Check connection of coil
• Check coil on line break
• Coil overheated (brown color change)
M12 • Change power circuit board
M13 • Check DIP-Switch adjustment on CPU-circuit board
M14 • Replace CPU-circuit board
M30 • Clear ventilation system
M31 • Clean fan
M32 • Connect fan directly at 230V
M33 • Change rectifi er circuit board
M34 • Measure heat-sink temperature sensor resistor
At 25º Celsius (77ºF) resistor will read 20kOhm
At 70º Celsius (158ºF) resistor will read 3,5kOhm
• Check short circuit to case
• For a test: short-out the sensor with a 20kOhm fi xed resistor
Disconnect temperature sensor
M40 • Switch off unit, cool down and switch on again. Use a pan with
cold water
Switch off fi eld!