Cozy P323664 (84166) Blocked Flueswitch.
The Cozy P323664 Blocked Flueswitch is a gas heater replacement part for Cozy Gravity Wall Furnace models W255G, W355G, and W505G, and for Cozy Vented Console Heater model VC501C.
Note that while P323664 is the replacement for the obsolete 84166, it is not an exact match. The temperature range for the obsolete 84166 switch was 350° F, give or take 16°. Part 84166 has now been replaced with part P323664 – which has a lower temp reading of 250° F, give or take 14°. According to the manufacturer, part P323664 is what is being used now; there is no other substitute for the 84166 switch.
* This Williams/Cozy replacement part can be returned within 30 days of your purchase as long as it has not been installed. Returned Williams/Cozy replacement parts must be in pristine condition and be returned with the original packaging. Buyer pays for return shipping and a 20% restocking fee will be deducted from the purchase price. If you have a question as to whether or not this Williams/Cozy replacement part is the correct replacement part for your Williams/Cozy Furnace please contact us prior to making your purchase.