This is a control assembly for a monitor 41 & 40 and you can also use for the 21 and 22 if you separate the panels of the back of this unit and install in yours (simple operation).....This was tested in the unit and does work fine (all buttons work as they should)...if this part does not cure your heater, than this part is not your issue (you replaced the wrong part)...I have several heaters I am parting out so contact me if you need parts.

WE SHIP FAST...WITHIN 24HRS OF PAYMENT!!! 

S/H is $11.75 in USA.....e-mail otherwise for quote BEFORE you bid. I accept PAYPAL, and other possible types of legal payments that eBay allows.....

ABOUT OUR PRIVATE LISTING (User ID kept PRIVATE): We now run all of our actions as private listings to protect YOU. Scammers can no longer grab your user ID to send spoof offers etc. and other eBayers cannot see what you are bidding on…We feel YOU deserve the right to bid with anonymity.

Sold as is due to age.

Import duties, taxes and charges are not included in the item price or shipping charges. These charges are the buyer's responsibility.

Please check with your country's customs office to determine what these additional costs will be prior to bidding/buying.

These charges are normally collected by the delivering freight (shipping) company or when you pick the item up – do not confuse them for additional shipping charges.

We do not mark merchandise values below value or mark items as "gifts" - US and International government regulations prohibit such behavior.