According to my CLD-97 (the LD Model just below yours) manual, "an H0, H1, or A (followed by a number) indicates the player is in an abnormal condition. When requesting service, please note the displayed number." Or to simplify, "You're F**ked". Try this:
1) turn on unit
2) press stop
3) turn off unit, and leave off for 10 minutes
4) unplug unit for 15 minutes
5) plug in unit for 5 minutes
6) turn on power switch, and give it a go.
Sometimes, this will reset a microprocessor that has developed a 'glitch'.