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.
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