GE DPGT750EC/GC Technical Service Manual

GE DPGT750EC/GC Technical Service Manual Manual pdf 40 page image

– 40 –PROBLEM POTENTIAL CAUSE DIAGNOSTIC PROCEDURE ACTIONLong Dry TimeDryer HeatingRestricted ductingCheck blower speed in Factory Test Modewith no clothes load. If blower speed ishigher an 2700 rpm - ducting isabnormally restricted and will cause longerdry timesCheck for kinked transition duct.Inform owner of clogged ducting.Lint filter/trap not cleaned Check filter and lint trap Clean accumulated lint.Washer not spinning out normally See washer troubleshooting Washer service guide 31-9103Washer additionalcapacity/overloadingInquire about consumer’s laundry habits.Harmony washer has about 30% morecapacity than other washers with agitators.If loaded to capacity, may result in longerdry times.Advise consumer of additionalwasher capacity and effects ondry time.Dryer operating at half-heat See Long Dry Time/Dryer Not HeatingLong Dry TimeDryer NotHeating Heater error (electric) Check service mode for heater error.If heater error is displayed,proceed with diagnosticprocedures in the order below.House wiring problem Verify voltage on L2 If voltage is 0 (zero), checkbreaker/fuses.Fixed Wattage Heater systemfailure (electric)Open backsplash, while in Factory TestMode, measure current through orangewire on inverter connector #17, currentshould be at least 12A when heater shouldbe on. If current is 0A (zero amps), check:1) Check continuity of wiring2) Hi-Limit and Outlet thermostatcontinuity3) Check heater coil resistance(about 17 ohms each coil)4) Check centrifugal switch function1) Check wiring and connectionsor2) Replace appropriatethermostator3) Replace heater assemblyor4) Replace motoror5) Replace inverter board ifchecks 1-4 are False.Variable wattage Heater systemfailure (electric)1) Open backsplash, enter Factory TestMode and measure current through L2(red wire) near terminal block - should beat least 24A at 240V when heater shouldbe on.2) Check heater coil resistance(about 17 ohms each coil)3) Check continuity of wiring1) If Fixed Wattage Heaterchecks are OK, and Currentthrough L2 is less than 24A, thenreplace Triac Boardor2) Replace heateror3) Repair wiring/terminalsCentrifugal switch failureCheck centrifugal switch continuity in openand closed state, according to theterminals shown on the mini-manual.Replace drum motor.Thermistor failureCheck room-temperature resistance ofthermistor. Outlet thermistor resistancerange is approximately 10K (10,000) ohmsat 77F (25C) and inlet thermistor range is227K (227,000) ohms at 77F (25C)Replace thermistor.Troubleshooting Charts