I have a Monitor 22 heater which has been installed but has not been used in about 4 years.

I turned it on today and it actually fired up and started heating for a while until it actually reset? and when it did so the burner LEDs were flashing together with the Time/Temperature setting.

Any thoughts/comments on how I can troubleshoot this?

Is there a manual that I can buy for learning more? I looked on eBay for Monitor 22 manuals, found nothing.

Thank you!