Patterson-Kelley MACH-05 ユーザーズマニュアル

 

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5.5.2  Auto-reset Service Codes 
 

b 08 

Air pressure switch open. 

The air pressure switch failed to close to indicate sufficient air flow to start the boiler. 

b 18 

Outlet high limit temp. 

The outlet water temperature has exceeded the internal high limit temperature setting. 

b 19 

Return high limit temp. 

The return water temperature has exceeded the internal high limit temperature setting. 

b 24 

Switched inlet / outlet. 

The inlet water temperature has been more than 18° F above the outlet for more than 
75 seconds. 

b 25 

Outlet temp rapid change. 

The outlet water temperature is increasing too fast.  Indicating low flow condition. 

b 26 

High exhaust back pressure. 

The high exhaust back pressure switch is tripped indicating a blocked stack, inlet, or 
condensate system. 

b 30 

Max delta T. 

The temperature rise across the heat exchanger is greater than maximum allowed, 
indicating insufficient flow. 

b 40 

Flue sensor open. 

The flue gas temperature sensor is indicating an open circuit. 

b 52 

High flue temp. 

The flue temperature has exceeded the maximum allowable setting. 

b 61 

Air pressure switch closed. 

The air pressure switch failed to open prior to starting the blower. 

b 65 

Fan speed incorrect. 

The fan is being directed to a higher speed than it is achieving. 

 

 

 

 

 

 

 

If any “Manual Reset” limit device trips, 

reset without determining and correcting the cause.