Question about Roper REX4634KQ Electric Dryer

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How do I know which thermal unit is the one that shuts the dryer off when the clothes are dry? one's called a cycling thermostat, another is called a fixed thermostat and the third is called thermal cut-off. This page won't let me enter the actual model number, so here it is. Roper REX4635EQ2 Electric Dryer

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Usually the Fixed Thermostat (also known as the High Limit Thermostat) and Thermal Cut-Out (TCO) are used in conjunction to regulate and protect the heating circuits.

The Cycling Thermostat (also know as the Internal Bias) controls the amount of heat required/desired to dry your clothes.

You need to remove the rear panel of the dryer to access the heating circuits on this model dryer. With the back panel removed, the heating circuits will be on the right hand side and the blower fan assembly is located on the left. The Hi-Limit Thermostat and TCO are located on the outside of the heater box with the Hi-Limit Thermostat mounted next to the heating element terminals and the TCO located at the opposite end of the heater box. The Cycling Thermostat is located on the blower fan housing next the Thermal Fuse. It will be the metallic round component, while the Termal Fuse will be a white plastic component.

For better clarification, you can view an exploded view diagram of your appliance at pcappliancerepair.com. If you type in your model number, all the parts I've mentioned are listed under Section 3 (Bulkhead Parts). The components are listed as follows:

Item 6 - TCO/Hi-Limit Thermostat Kit (both parts should be replaced at the same time).
Item 15 - Hi-Limit Thermostat (sold separately)
Item 23 - Thermal Fuse
Item 24 - Cycling (Internal Bias) Thermostat

If you are experiencing heating problems or longer dry times, please review the following link:

http://www.fixya.com/support/r630242-dryer_runs_but_not_heat

Pay particular attention to the section that discusses dryer ventilation. The majority of dryer heat related problems and failures are attributed to poorly installed, clogged, or kinked dryer ventilation. If you haven't had the ducting checked in a while, now may be a good time to do so.

If you have any questions, or require additional assistance, please let me know. I hope this helps you.

Posted on Sep 10, 2009

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Related Questions:

1 Answer

Where is the cycling thermostat?


usually located on the blower next to the thermal shut off, cycling had 4 prongs where as the others have 2

Jul 12, 2014 | Samsung DV210 27 Electric Dryer with 7.3...

1 Answer

Why is my dryer running, but not heating up or drying the clothes?


ELECTRIC Dryer no heat or little heat, or shuts down to fast:

Check your venting and lint basket. Check blower for lint build up and blower wheel obstruction., test by trying to turn the wheel manually by hand (should be easy) May have to remove cabinet or front/back plate to get to it)

Next check the heating element itself with a meter for continuity OHMS CLOSED CIRCUIT. If not its defective or has a short if its grounding out? Which in turns causes blown fuses or thermostats or overheating.

Check dryer Terminal block prongs both outside prongs should give combined 220, and 110 each if u check 1 outside & 1 center (ground) prong. Also check house electrical outlet for full voltage. 220 because if u only get half or 110 volts you will be able to run the machine which uses only 110 to run motor but not the heater which uses a full 220,

Check the thermal cut off, the cycling and the hi limit thermostats.
For continuity or OHMS. If no ohms or resistance they need replacement.

In some dryer's the control panel relies on a thermistor rather than a CYCLING thermostat to regulate the drum's air temperature by monitoring the component's resistance changes; resistance goes down as temperature increases and up when temperature decreases. Once the drum's air temperature reaches a certain level required to dry clothes, the control panel shuts off the heater. The panel will turn the heater on again and begin another heating cycle when the thermistor indicates that more heat is needed to keep the air temperature constant inside the drum

Lastly check your moister sensor. ( located inside the dryer door usually) Especially if machine seems to shut down early and clothes are still wet.
Test with a meter at room temperature and it should show continuity.
A failed moisture sensor will affect the dryer run time in the automatic moisture sensing cycle but it will not affect the heating of the dryer or the timed cycle. Which are reflected by the thermostats.

Read more :http://www.ehow.com/info_12203962_check-dryer-thermistor.html

Jun 23, 2014 | Kenmore Dryers

1 Answer

Sears dryer, model# 110.87562601.


ELECTRIC Dryer no heat or little heat, or shuts down to fast:

Check your venting and lint basket. Check blower for lint build up and blower wheel obstruction., test by trying to turn the wheel manually by hand (should be easy) May have to remove cabinet or front/back plate to get to it)

Next check the heating element itself with a meter for continuity OHMS CLOSED CIRCUIT. If not its defective or has a short if its grounding out? Which in turns causes blown fuses or thermostats or overheating.
Check dryer Terminal block prongs both outside prongs should give combined 220, and 110 each if u check 1 outside & 1 center (ground) prong. Also check house electrical outlet for full voltage. 220 because if u only get half or 110 volts you will be able to run the machine which uses only 110 to run motor but not the heater which uses a full 220,
Check the thermal cut off, the cycling and the hi limit thermostats.
For continuity or OHMS. If no ohms or resistance they need replacement.

In some dryer's the control panel relies on a thermistor rather than a CYCLING thermostat to regulate the drum's air temperature by monitoring the component's resistance changes; resistance goes down as temperature increases and up when temperature decreases. Once the drum's air temperature reaches a certain level required to dry clothes, the control panel shuts off the heater. The panel will turn the heater on again and begin another heating cycle when the thermistor indicates that more heat is needed to keep the air temperature constant inside the drum

Lastly check your moister sensor. ( located inside the dryer door usually) Especially if machine seems to shut down early and clothes are still wet.
Test with a meter at room temperature and it should show continuity.
A failed moisture sensor will affect the dryer run time in the automatic moisture sensing cycle but it will not affect the heating of the dryer or the timed cycle. Which are reflected by the thermostats.
Read more :http://www.ehow.com/info_12203962_check-dryer-thermistor.html

Jun 23, 2014 | Kenmore Dryers

1 Answer

My dryer dries for a short period time and senses that the cloths are dry before the cloths actually are dry. Can I reset the electronics some how?


no. what you are getting is an over heat sense and is shutting the unit down this is a safety type of thermostat and will shut down the heating cycle prematurely as it will with a clogged vent or lint filter

Aug 23, 2009 | Whirlpool GEW9250 Electric Dryer

2 Answers

My dryer takes long time to dry the clothes. It


Check the following areas thoroughly to address this issue.


1. Venting
Make sure the dryer vent hose, as well as the rest of the vent duct, is not clogged.

Unless regular maintenance is performed, chances are there is a lot of lint accumulated inside the dryer. This might affect the drying time and could be a fire hazard. Make sure to have your dryer cleaned regularly. Because this might involve taking most of the dryer apart, it is recommended to have a qualified appliance repairman perform this task.

2. Thermostat
There are a couple of cycling thermostats inside the dryer. If one of them breaks down, it might affect the dryer's performance. Replace the defective thermostat.

3. Heating element
A heating element might only be partially burned out, in which case it would still work but will take longer time to dry the clothes. Replace the element if found defective.

NOTE***(This unit is equipped with a dryness control board. if all points above check out ok, replace this board).

Jul 21, 2009 | GE Profile Harmony DPGT750EC Electric...

1 Answer

My dryer used to shut off before the clothes are dry - now it wont start at all


Ok, the light will not come on if the door pressure swicth is damaged and, the dryer will not start if this switch is damaged as well. replace the door pressure switch asap.

Ok, concerning the interuppted drying cycle due to high heat, this can be cuased by two issue. It coudl be a venalation issue. if the dryers vent duct and exuast hoses are clogged, thsi will cuased the element to reach unsafe tempreturs, in return, tripping the high limit thermostsat and shutting the dryer off in the middle of the load cycle.

Another problme spot woul dbe a fualty high limit thermaostae. Although this is highly unlikey, this coudl be your issue.

Most dryers have a thermal fuse, which burns out when the dryer overheats, in which case the dryer will either not run at all or stop heating. The fuse is usually located on the vent duct, inside the dryer. A blown fuse will show no continuity when measured with a meter. Before replacing the fuse, make sure the blower wheel is not broken or clogged, and there is nothing blocking the venting.


Note: It is recommended by most dryer manufacturers to replace a hi-limit thermostat when replacing a thermal fuse.

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Maytag Performa Electric Dryer Won't Start


check the blower wheel, sounds to me like it is loose on the blower motor, common on these dryers. One sure sign would be a warped filter and a rusted top. The blower aint putting out enough and the dryer is over heating .

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1 Answer

Flame only stays on for five minuts. After start


the flame doesn't stay on the whole drying time, it cycles.The thermal fuse allows machine to work and heat up but the cycling thermostat directs the flame to come on and shut off. Do your clothes dry fine?

Mar 04, 2009 | Kenmore 60172 Electric Commercial Dryer

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