Laser 72 is overheating. Top gets too hot to
Laser 72 is overheating. Top gets too hot to touch and unit smells of high heat. Must be getting too much fuel or not controlling amount of fuel in chamber. What gives? Eventually it does shut down, but its scary.
Heating & Cooling - Rinnai - Toyostove Direct Vent Heater: Toyostove Laser 73 Shipping
Answers & Comments
Check the fan cage on the back, it should be cleaned to allow for adequate air flow. Be sure curtains are not getting pulled up to the fan cage.
This could also be due to a crack in the pot, or if you put too much fuel treatment in your fuel. Regardless of what is causing the overheat situation, an L 72 is a very old unit. You may not want to invest a great deal of money into repairing this unit. The manufacturer has discontinued several parts for the L 72 such as the main circuit board and the burner rings. Without these parts, you are out a heater.
If you can clean the fan cage and remedy the problem, that would be great. If it is a cracked pot, and you decide to replace, be sure that you know how long it has been since you replaced the ring. A ring in a Laser lasts about 7 years. If your technician does not have rings in stock, you could be out of luck when your unit needs a ring.
Be sure to plug the unit into a dedicated outlet and use a quality surge protector with at least 450 Joules to help protect the board. Hope this was of some help. If you have any further questions, visit www.keepuswarm.com. We do have inventory of these discontinued parts for Laser heaters if you decide to repair and your technician cannot get the needed parts.
Main circuit board for Laser 72 or Main circuit board for Laser 55. Blower Motor Assembly with Case for Laser 72 or Laser 55, and Burner Ring for Laser 72 or Laser 55 Toyotomi Laser heaters are all limited availability. If one of these parts is needed for your repair, visit www.keepuswarm.com.
Does the heater shutdown because of an overheat? I worked on one LR-72 that once it started burning wouldn't stop until it shutdown on high heat. Tried replacing the main ckt brd but that didn't work. I then replaced the display ckt brd and that took care of the problem. I still have the new main ckt brd.
My Laser 72 is doing the same will run on "lo fire" ok eventually it switches to "hi fire" and then wants to run to destruction until it shuts down on overheat. Both fans are silky smooth and have not failed. I was hoping someone out there had a test procedure to verify what has failed.