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hw error 000000800 and000020000

I am getting a Hw error in eurotherm epack-3ph, it is installed for a furnace controller and in one zone it gives and error hw error 000000800 and in other zone it gives 000020000, how do I diagnose the exact cause for these errors?. The furance was working fine and was idle for 3-4 days and when turned back on again it gave this error. What should be done..? It doesn't get cleared off when acknoldged and the thyristor is not firing
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