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Troubleshooting CoolMatic MR07, MRR07, MH07
36
Unusual noises
Device does not heat
Fault Possible cause Remedy
Loud humming A component of the refrigerant circuit
cannot move freely (touching the wall)
Bend the component
carefully away from the
obstruction
Foreign body jammed between the
cooling unit and the wall
Remove the foreign body
Fan noise (if installed)
Fault Possible cause Remedy
U
TERM
= 0 V There is an interruption in the connec-
tion between the battery and
the electronics
Establish a connection
Additional supply line fuse has blown
(if installed)
Replace the supply line
fuse
U
TERM
U
ON
Battery voltage is too low Charge the battery
Start attempt with
U
TERM
U
OFF
Loose cables
Poor contact (corrosion)
Establish a connection
Battery capacity too low Replacing the battery
Cable cross section too small Replace the cable
(fig. 8, page 6)
U
TERM
Voltage between the positive and negative terminals of the electronics
U
ON
Cut-in voltage of the electronics
U
OFF
Cut-off voltage of the electronics
36


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