How to fix

That error indicates a bad keypad. You will have to replace the keypad/control console assembly.

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A faily common problem. You need a new display panel to fix that. The display panel comes separate from the control board.

Sounds as though you'll have to replace it again. There isn't much else it can be. Is there a chance that the house is not well grounded? Lighting and the such can do this.
given the cost of parts....Look to price shop a new one before fixing this one.

Was it new? normaly when a microwave deos not heat it means the magnetron is dead (that's the part of the oven that produces the microwaves) or it could be a burned fuse, if it's a dead magnetron it is almost as expensive as a new oven.

Good luck!

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Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101

Aounds like ***********-in-law cooked the magnetron. If a microwave runs for an extended period with nothing in it, the magnetron (thing that makes the microwaves) is likely to have failed.

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Took it to a repair shop ,cannot be fixed ,no parts discontinued microwave.

Throw it away and get another microwave

First, check the fuse usually located above the display, inside the top lid.  You can't see if it's blown, so you must test it for continuity with a meter or self powered test light.  Usually fifteen amp, and of the ceramic variety.  (available at radio shack type places) If the new one blows instantly, it's likely a door switch shorted out.  If it blows after a few seconds, it could be the magnetron gone bad, or internal arcing.  The main transformer will sometimes short out, but that's rare.   Be absolutely careful, should your fingers venture around the magnatron connections down below, as there is high voltage and current that can kill you.  This warning applies even when it's unplugged!
The door switches operate together, so if one slams the door shut it will often blow the fuse with no other damage.  Sometimes the crow-bar switch will sustain damage in the process.  Usually, if the switches click individually, they're good.  If one doesn't click, it'll almost always be shorted.  They're located behind the door catch, inside the unit beside the display board, and a bit hard to access.  You will need to reach past the magnatron for this, so be careful.  

h 97 is an inverter or magnetron fault you will need an engineer to fix try 08705 678910 for help,dont try to repair yourself risk of shock stored energy.