Axpert / Mercer cooling fan runs continiously

Good day, all.

Please assist with a problem I have with my 4 yr old Axpert / Mercer Inverter. The fans used to stop during the night on low loads. With loads as low as 150Watts the fans are still running. Any suggestions or info I can share?

Sounds like the intake filter/vents are blocked - if it has, use a vacuum cleaner or remove and wash them.