Boiler keeps flashing 0
I don't have much experience with these it here my thoughts. Have you verified your steam supply pressure with a gauge? Does the boiler have a pressure transducer to signal the PLC? Call Steris tech support with boiler mod# and sn#. 800-333-8848.
try cleaning and replacing the water level sensing probes. Flush the boiler and see if that helps to correct the problem.
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