Product review (2 stars): Product Failed for Lack of a Quality Gasket Material
This part is probably fine (a five star part) but all I needed was the gasket.  Because Honeywell does such a poor job engineering this device, all of us owners have had ridiculous problems.  I fought the leaky tank problem for a couple of years before I could get a new one.  A tank should NEVER develop a leak if engineered properly in the first place.  After tank replacement, my unit worked OK during last winter season.  In starting up for this season, now I have the "six blinking" lights error saying this part is defective.

Well, I took it apart and the contacts (just like my heating element) are bright and shiny.  I use soft water so I never get buildup.  However, upon removal, the gasket is destroyed.  It looks like it was never seated properly from the factory.  Of course, Honeywell would never admit that error!  In addition, a foam gasket is not the right material for this application. There are numerous high-temperature gasket materials available but they might cost Honeywell a dime more to use.

I am going to try and seal the unit with RTV silicone before I spend $39 for a $0.15 gasket. If that works, I will come back and update the review.  PS, the plastic electrode holder also has a crack so I will seal that as well.

Obviously, Honeywell can't engineer these devices. That is why one of my local major HVAC companies has dropped the line. To many HVAC installers get too many callbacks.  Looks like my eventual replacement will be a White Rodgers unit.  In the interim, if I can nurse this along, I will since I own it.

PS, as others have said, replacing this part is very easy so if you have "six blinking lights" don't hesitate to try.  The top comes off with one screw but it must be "wiggled" to free it up.  If you use hard water, then take the opportunity to inspect/clean your tank and heating element while you are at it.  Read the manual first.