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MACH® Series Gas-Fired Boiler
5.5.2 Auto-reset Service Codes
Code
Lockout
b 08
Air pressure switch open.
b 24
Switched inlet / outlet.
b 25
Outlet temp rapid change.
b 26
High exhaust back pressure.
b 30
Max delta T.
b 40
Flue sensor open.
b 52
High flue temp.
b 61
Air pressure switch closed.
b 65
Fan speed incorrect.
The air pressure switch failed to close to indicate sufficient air flow to start the boiler.
The inlet water temperature has been more than 18° F above the outlet for more than
75 seconds.
The outlet water temperature is increasing too fast. Indicates a low flow condition.
The high exhaust back pressure switch is tripped indicating a blocked stack, inlet, or
condensate system or external interlock jumper is open.
The temperature rise across the heat exchanger is greater than maximum allowed,
indicating insufficient flow.
The flue gas temperature sensor is indicating an open circuit.
The flue temperature has exceeded the maximum allowable setting.
The air pressure switch failed to open prior to starting the blower.
The fan is being directed to a higher speed than it is achieving.
Page 35
Description
Maintenance
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