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Marathon  

 

 

 

 

 

International 

 

 

BAXI LUNA 310 Fi  Troubleshooting Guide 

Before getting started, remember……….. 

All 

BAXI LUNA

 boilers are tested during manufacture for correct operation and are 

shipped to you factory tested for correct operation. 
 
Most of the faults experienced on start up are field issues associated with items 

external 

to the boiler. These are mostly simple problems, such as: 

 

Venting installed incorrectly 

 

Air in the system (system must be fully purged) 

 

Air in the gas line 

 

Undersized gas line 

 

System not flushed (cold flush then hot flush) 

 

Incorrect connection of external equipment 

 

Leaks in the Heating system and pipe-work 

 

When commissioning the boiler, only a few items need to be checked: 

 

Inlet gas pressure (static and working inlet pressure of boiler running at       
maximum output) 

 

Maximum and minimum burner pressures 

 

Power supply for polarity and ground 

 

When troubleshooting 

BAXI LUNA

 boilers avoid changing parts prematurely, 

assuming that the boiler component is defective. In our experience, items such as the 
control PCB are changed incorrectly, when it is another component supplying false 
information to it. Likewise, the pump is changed because it has stopped operating. 
This is normally due to contamination from a dirty hydronic system. The pump can be 
removed and cleaned; after which the heating system must be flushed and cleaned. 
 

Get all the information before going to the job site…………… 
 

Get as much information from your customer before you go to the boiler. Model of 
boiler, type of venting, type of system and layout connected to the boiler, how long has 
the system been installed and is this an isolated breakdown or are they repeatedly 
resetting the boiler. 
Don’t be afraid to ask the obvious questions! Do they know how to reset the boiler? 
Just unplugging the lead and replacing it or turning the boiler off and on again will 
not reset the logic board. They have to turn the switch to the “R” to restart the boiler. 
Is there any water in the system? Where is the needle on the pressure gauge? 

This 

may save an unnecessary trip to the job site. 

 
 

 

 

April 2004 

1815 Sismet Road                                  phone: 800-461-4657 
Mississauga, Ontario   

                       

fax: 905-602-7422 

L4W 1P9  CANADA    

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