Troubleshooting Charts - GE DPGT750EC/GC Technical Service Manual

Troubleshooting Charts

PROBLEM POTENTIAL CAUSE
Long Dry Time
Dryer Heating
Restricted ducting
Lint filter/trap not cleaned
Washer not spinning out normally
Washer additional
capacity/overloading
Dryer operating at half-heat
Long Dry Time
Dryer Not
Heater error (electric)
Heating
House wiring problem
Fixed Wattage Heater system
failure (electric)
Variable wattage Heater system
failure (electric)
Centrifugal switch failure
Thermistor failure
DIAGNOSTIC PROCEDURE
Check blower speed in Factory Test Mode
with no clothes load. If blower speed is
higher an 2700 rpm - ducting is
abnormally restricted and will cause longer
dry times
Check filter and lint trap
See washer troubleshooting
Inquire about consumer's laundry habits.
Harmony washer has about 30% more
capacity than other washers with agitators.
If loaded to capacity, may result in longer
dry times.
See Long Dry Time/Dryer Not Heating
Check service mode for heater error.
Verify voltage on L2
Open backsplash, while in Factory Test
Mode, measure current through orange
wire on inverter connector #17, current
should be at least 12A when heater should
be on. If current is 0A (zero amps), check:
1) Check continuity of wiring
2) Hi-Limit and Outlet thermostat
continuity
3) Check heater coil resistance
(about 17 ohms each coil)
4) Check centrifugal switch function
1) Open backsplash, enter Factory Test
Mode and measure current through L2
(red wire) near terminal block - should be
at least 24A at 240V when heater should
be on.
2) Check heater coil resistance
(about 17 ohms each coil)
3) Check continuity of wiring
Check centrifugal switch continuity in open
and closed state, according to the
terminals shown on the mini-manual.
Check room-temperature resistance of
thermistor. Outlet thermistor resistance
range is approximately 10K (10,000) ohms
at 77F (25C) and inlet thermistor range is
227K (227,000) ohms at 77F (25C)
– 40 –
ACTION
Check for kinked transition duct.
Inform owner of clogged ducting.
Clean accumulated lint.
Washer service guide 31-9103
Advise consumer of additional
washer capacity and effects on
dry time.
If heater error is displayed,
proceed with diagnostic
procedures in the order below.
If voltage is 0 (zero), check
breaker/fuses.
1) Check wiring and connections
or
2) Replace appropriate
thermostat
or
3) Replace heater assembly
or
4) Replace motor
or
5) Replace inverter board if
checks 1-4 are False.
1) If Fixed Wattage Heater
checks are OK, and Current
through L2 is less than 24A, then
replace Triac Board
or
2) Replace heater
or
3) Repair wiring/terminals
Replace drum motor.
Replace thermistor.