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Your cart is empty.This is a Brand New OEM Furnace Replacement 3" Limit Switch
Jeff Snider
Reviewed in the United States on February 12, 2025
Not an OEM part. Will have to modify a little bit to keep it from shorting out the control board.
Robert L. Carr
Reviewed in the United States on March 8, 2024
Worked as intended. Happy customer
Al Young
Reviewed in the United States on February 3, 2024
Offset slots for mounting were perfect. Spade connectors correct size. Seems to be working.
C. Nigrelli
Reviewed in the United States on December 17, 2024
Saved money replacing it myself.
Karen Snyder
Reviewed in the United States on October 12, 2024
I bought this Brand because it was fast delivery and matched the specifications of my original switch (my furnace is an Armstrong). The original switch is no longer available and the replacement is Armstrong 36W90 - A number of companies use the same switch. The screw holes are even the same. The quality of this replacement looked good and the furnace is now up and running. The photos show the new switch installed the other two photos show the older black switch (Armstrong) and this new Trane switch.
CrippleKid60303
Reviewed in the United States on January 16, 2024
Easy to install & this will replace MANY made type Furnaces.You must match operation specs to your furnace !
Karla Webber
Reviewed in the United States on November 8, 2021
I placed an order for high limit switch that was supposed to be an OEM Trane C340056P04, Open 190 – (30). The merchant was: HVAC Pros. I received a Supco SHL503, Open 190 - (40). This is not an OEM part as the other reviews have also previously noted.The stiff wires leading to the sensor on the Supco lay flat rather than vertical like the Trane OEM part. This causes the interior of the switch to be slightly wider than the OEM switch. This small change caused the screw holes to line up improperly because the stiff wire hits the furnace housing. You either have to make a new hole or install one screw diagonally.I am using Nest Thermostats and have two identical Trane furnace units in my house. I am able to switch parts between the units to diagnose problems. One of my units had a P04 OEM Limit Switch the other a P05, Open 200 – (30). The furnace containing the P04 was showing a 4 blink code on the board which indicates the high limit switch was the likely problem. I removed the P05 from the working furnace and installed it in the down furnace and it fired right up.I initially went to Grainger because I wanted heat ASAP. Their system showed a Supco SHL508 as a replacement, Open 190 – (20). This part did not work. It had the same alignment issues listed above. Also, when installed the Nest Thermostat showed an error with the W wire.I paid almost double to order this item from Amazon because it was supposed to be identical to the OEM Trane P04 switch I removed. This was obviously not the case. The Supco SHL503 also resulted in the same W wire error on the Nest Thermostat.To confirm that I had not blown a fuse I removed the working P05 switch from the opposite unit and reinstalled in the non-working unit. The furnace fired right up.I was reading a theory that the Supco switch sensor could possibly be hitting the furnace housing flap when the misaligned screws were tightened resulting in a short. I took the Grainger unit I had originally purchased and slid the internal fabric covers forward covering the tips of the terminals touching the sensor and I slightly bent the sensor arms up. When I reinstalled the switch the furnace began to work. It remains to be seen if this is a permanent fix.I will be returning the Supco SHL503 received from Amazon 1) Because it was an inaccurate item description 2) It was twice the cost as the item I had already purchased from Grainger.Just be aware that if you are attempting to use a Supco SHL503 or SHL508 they are not direct replacements for Trane C340056P04 / SWT01259 or C340056P05 / SWT01260. However, you might be able to get them to function with slight modification. Just order an OEM from a reputable dealer rather than deal with the uncertainty.
Customer
Reviewed in the United States on December 10, 2017
Service call to replace this item was going to me around $900.00. Took me about 30 min. - I am not a mechanic - just do one wire at a time. Furnace people are right - might be cheaper to get a new furnace than to let them fix the old one - but if you do it yourself - you can save the cost of a new furnace. Furnace is 17 years old - it works just fine & new replace parts are much better than the factory ones.Denny
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