SERVICE MANUAL
Medi-Therm II
w
w
w
.g
aymar
.com P/N 10187-000 7/98
TROUBLESHOOTING CHARTS
No
Yes
from
"BLANKET WILL
NOT COOL"
(figure 6L,
page 1 of 3)
Suspect
control/display
board.
Repair/replace.
Suspect
RT1.
Repair/replace.
Does
compressor
turn ON at 37.9°F
(3.3°C) and OFF at
Possible reservoir
probe (RT1)
problem. Enter
Service Mode 5.
No
No
Yes
Yes
No
Yes
No
Yes
Yes
No
Replace.
See power supply
board schematic.
Suspect
compressor
capacitor.
Suspect
compressor unit
thermal overload.
Suspect
compressor unit
starter relay.
Suspect
board-to-board
connection.
Repair.
Suspect
transistor Q12.
Repair/replace
power supply
board.
Suspect
base-to-power
supply board
connection.
Repair.
Suspect
relay K1.
Replace.
Is
pin 6 ref to
pin 10 of U51
0 VDC
?
Is
input signal
to transistor Q12
0 VDC
?
Is
12 volt signal
at transistor Q12
output
?
Is
12 VDC
across relay
K1 coil
?
Remove jumpers
(from pin 6 to pin 9
and from
pin 4 to pin 7).
Jumper
relay K1 contacts,
(pin 6 to pin 9,
and pin 4 to pin 7).
Is
compressor
on?
?
42.4°F (5.8°C)
Figure 6L—Blanket Will Not Cool, Page 3 of 3
56
