![]() Defective gas valve make sure inlet pressure is below maximum on rating plate before replacing valve.Loose or incorrect fan speed control connectionĪ flame signal was present when there should be no flame.Loose or miswired fan speed harness (if “b61” error code is observed while fan is running).Pressure switch circuit closed with fan off Temperature rise between supply and return is too high. Verify' that pump is operating and that pump and piping are sized per Part VIII of this manualīoiler safety limit, or external limit wired across terminals 3&4, is open. Supply water temperature has risen too quickly ![]() Verify that system is purged of air and that appi valves are open. Condition must be present for at least 75s for this error code to appear. MCBA is reading a return sensor temperature higher than the supply sensor temperature. MCBA return sensor detected temperatures in excess of200☏
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