The two biggest killers of circuit boards and motors are heat and moisture. In this video we explain how both heat and moisture could be damaging your Husqvarna EPOS Automower without you knowing it. During the 2024 mowing season we had several EPOS Automowers in for repairs. Some of these repairs required circuit boards like the COM board or main board needing to be replaced. Or an occasional wheel motor having constant errors and needing to be replaced. When these mowers would come in we would make the repairs and and get them back out to catch up with the mowing, but we would always look over them to see if we could find any common denominators between issues we would see. When we opened the chassis of a few EPOS mowers and found corrosion on 2 circuit boards, but we didn’t have rain in months, that made us really question if this was just coincidence or if there was a connection between them. Over time we did notice one similarity between the EPOS mowers with these seemingly odd premature board and motor failures. What all of these mowers had in common was that the chassis air filter was covered in dust and dirt to the point that you could hardly even see it! If you’re unfamiliar with where the chassis air filter is located, it is under the STOP button. There are 3 screws that need removed in order to remove the entire STOP/START button assembly. This is the same procedure for the 450X EPOS, 450XH EPOS, 520 EPOS, 520H EPOS, 550 EPOS, and 550H EPOS Husqvarna Automower models. What happens is dirt and debris quickly builds up in the space under the START/STOP button and ends up covering the chassis filter. When the filter gets clogged that means outside air can get in to the chassis to help cool circuit boards and motors and the heat inside the chassis is trapped there and keeps building. Without air being able to enter and leave the chassis you can have boards and motors overheating. And when you have different temperatures between the inside of the chassis and the outside air there is a rick of condensation starting. When condensation forms it is most likely to build up on the bottom side of circuit boards mounted in the upper chassis and start causing the board components to corrode. While we can’t say that the clogged up air filters were the definite cause of the issues we were seeing with these models of EPOS Automowers, it for sure did not help the situation. If you have a 450X EPOS, 450XH EPOS, 520 EPOS, 520H EPOS, 550 EPOS, or 550H EPOS Automower we recommend taking the START/STOP button assembly off and blowing out the area under it at least 2 or 3 times a season to help prevent the filter from being clogged. The chassis air filter should be replaced after every season. We have individual chassis air filters available and we have the air filter included in our maintenance kits for these EPOS Automowers.
Chassis Air Filter:
Maintenance Kit w/ Filter:
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Issues this year were almost certainly firmware/new wheel motor related. Had several mowers with bad parts out of the box or crapped out within a week. Husqvarna quality is really going down hill, don’t see these kinds of issues with other brands.
Thank you for pointing this issue out! Do you know often should you replace that filter?