Frigidaire gas dryer not so hot
Posted 17 January 2006 - 07:00 PM
My FSG748GFS0 dryer has recently (after 6+ years of dependable service) decided it wants to cycle through the heat cycle just once. Having read sensai's web pages, I assumed the venting must be inadequate (or in this case diminished after six years of lint buildup). So I ordered a vent brush and reamed that puppy good. Got a few handfuls of lint out (less than I would have imagined) and reconnected the dryer but no dice; it still only cycles once. Sensai also says to disconnect and run without venting to determine if excessive back pressure is the cause. I followed his advice and once again, no dice. Watching the dryer in the dark, I can see that the ignitor glows (roughly six seconds) and I get gas ignition (once). Subsequently, the gas is shutoff (so I assume the high limit thermostat is working okay) and as the temperature drops, the ignitor glows a second time but no ignition occurs. If the dryer is stopped and allowed to rest for 10-15 minutes, I can start the whole shebang over again. I can dry a load of clothes in say three to four hours so who am I to complain. I picked up a handy dandy multimeter and started testing individual components following the master of appliantology's learned advice. The ignitor has continuity as do the holding & boosting coil and the secondary coil. Interestingly, the specs given for the whirlpool coils matches mine to a tee; however, the resistance from 4th to 5th contact (1275 ohms) was slightly outside the listed range of acceptable values (1220 +/- 50). The radiant sensor appears defective; having metered it while completely disconnected and removed from the dryer, I could not get any appreciable measurement of resistance when shining a flashlight directly into the sensor window. In other words, the resistance is the same in both darkness and bright light (approximately .4 ohms which I assume is merely the resistance of the wire). That said, the wizened one suggests that if the RS were defective, I would be experiencing a different set of symptoms (as described on his web pages for novices such as myself). I do not want to engage in the shotgun approach so I am seeking feedback. Should I start with the RS or the coils (even though they appear to spec out)? I took one additional measurement; the control thermostat which is rated at 2.95K ohms metered at 2944 ohms so I will assume that this component is fine too. If the RS is shot, how am I achieving ignition the first time around? So many questions, not enough beers.
Posted 18 January 2006 - 02:31 AM
This is common problem for the coils to break down internally as they heat up after the first cycle of heat.
Willie's Budget Appliance Repair
Eureka, CA 95501
Posted 18 January 2006 - 08:18 AM
Posted 19 January 2006 - 09:59 AM
Posted 29 December 2013 - 09:30 PM
Okay, it's eight years later and the coils appear to be shot again but I have a new symptom. As the igniter begins to glow, a rattling occurs for about 4-5 seconds. The thermostat seems fine as the dryer wants to fire the burner and the igniter is definitely working as it heats up and glows. Any suggestions as to what could be causing this rattling?
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