Freezer Heater Testing; Fresh Food Heater Testing - GE Profile PSB42LSRBV Technical Service Manual

Fresh Food Heater Testing

The fresh food evaporator defrost heater,
evaporator drain pan heater, and icemaker fi ll
tube heater are in a parallel circuit. The heaters
are in series with the bimetal defrost safety
thermostat.
Check for a combined resistance of 91 Ω at CN09
on the terminal block, between pin #1 and pin #2,
when the defrost safety thermostat is closed.
When the fresh food is in the defrost test mode
1 4 (see
Service Diagnostics
at CN09 on the terminal block, between pin #1
and pin #2.
Note: Access to the evaporator is necessary to
complete testing of the above components, with
exception of the icemaker fi ll tube heater.
BIMETAL
THERMOSTAT
FF DEFROST HEATER 120
FF DRAIN HEATER 440
FILL TUBE HEATER 2.6K
• The resistance value of the defrost heater is
approximately 120 Ω.
• The resistance value of the drain pan heater
is approximately 440 Ω.
• The resistance value of the icemaker fi ll tube
heater (referred to as the "PIPE HEATER
ICE WATER" on some schematics) is
approximately 2.6K Ω.
• The defrost safety thermostat is a bimetal
type which will open at 140°F (60°C) and will
reset at 104°F (40°C).
) check for 120 VAC
CN09
WHITE
1
RED
2
– 43 –

Freezer Heater Testing

The freezer evaporator defrost heater, suction
line drain pan heater, and the evaporator drain
pan/drain tube heater are in a parallel circuit.
The heaters are in series with the bimetal defrost
safety thermostat.
Check for a combined resistance of
approximately 38 Ω at CN07, on the terminal
block, between pin #1 and pin #2.
When the freezer is in defrost test mode 1 4 (see
), check for supply voltage of
Service Diagnostics
120 VAC at CN07 on the terminal block, between
pin #1 and pin #2.
Note: Access to the evaporator is necessary to
complete testing of the above components, with
the exception of the suction line drain pan heater.
BIMETAL
THERMOSTAT
DEFROST HEATER 44
SUB HEATER 377
DRAIN HEATER 1.3K
• The resistance value of the defrost heater is
approximately 44 Ω.
• The resistance of the suction line drain pan
heater (referred to as the "
some schematics) is approximately 1.3K Ω.
• The resistance value of the evaporator drain
pan and drain tube heater (referred to as
the "SUB HEATER" on some schematics) is
approximately 377 Ω.
• The defrost safety thermostat is a bimetal
type which will open at 140°F (60°C) and will
reset at 104°F (40°C).
CN7
BROWN
1
ORANGE
2
on
DRAIN HEATER"