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MACH® Series
Gas-Fired Boiler Maintenance
Page 34
5.5.1 Manual Reset Service Codes
Code Lockout Description
E 00 False flame. A flame signal is present when it shouldn’t be.
E 02 Flame failure. The burner did not light on startup, or loss of flame during run.
E 03 Gas Valve error. Check all gas valves electrical connections.
E 04 General lockout. The power was lost after a lockout. The control loses the description of the lockout on
power loss.
E 05 Internal control failure. Call for service.
E 06 Internal control failure. Call for service.
E 07 Internal control failure. Call for service.
E 08 Air pressure switch open. The air pressure switch failed to close to indicate sufficient air flow to start the boiler.
E 11 Internal control failure. Call for service.
E 12 External limit open. One of the external limits has opened. (High/Low Gas Pressure, High Temp, Low water).
E 13 Internal control failure. Call for service.
E 14 Internal control failure. Call for service.
E 15 Internal control failure. Call for service.
E 16 Internal control failure. Call for service.
E 17 Internal control failure. Call for service.
E 18 Outlet high limit temp. The outlet water temperature has exceeded the internal high limit temperature setting.
E 19 Return high limit temp. The return water temperature has exceeded the internal high limit temperature setting.
E 25 Outlet temp rapid change. The outlet water temperature is increasing too fast. Indicating low flow condition.
E 28 No blower feedback. The blower should be running but it is not, or the feedback signal has been interrupted.
E 29 Blower feedback will not zero. The blower will not go to zero speed even though it should be off.
E 31 Outlet sensor shorted. The outlet temperature sensor is short circuited.
E 32 Return sensor shorted. The return temperature sensor is short circuited.
E 33 DHW sensor shorted. The DHW temperature sensor is short circuited.
E 35 Flue sensor shorted. The flue gas temperature sensor is short circuited.
E 36 Outlet sensor open. The outlet temperature sensor is indicating an open circuit.
E 37 Return sensor open. The return temperature sensor is indicating an open circuit.
E 38 DHW sensor open. The DHW sensor is indicating an open circuit.
E 40 Flue sensor open. The flue gas temperature sensor is indicating an open circuit.
E 44 Internal control failure. Call for service.
E 52 High flue temp. The flue temperature has exceeded the maximum allowable setting.
E 60 Internal control failure. Call for service.
Note: When an Internal Control Failure occurs, as identified by E-Codes listed above, the failure is internal to the
MCBA and replacement of the MCBA is required. A qualified service technician must be called to replace the
MCBA device.