Lochinvar Copper-fin II/IIE Boiler, Water Heater and Pool Heater 402 - 2072 Manuel D’Utilisation

- Gas supply problem.  

 • Refer  to  the  Gas Connections Section of the 

 

 Installation and Operation Manual for detailed 
  information concerning the gas supply.

- Gas/air mixture problem.

 • Refer  to  the  Checking  Manifold Gas Pressure and 

  Combustion Analysis Procedure on pages 27 and 28 of 
 this manual for the proper settings. Verify 
  that the vent/air intake lengths do not exceed the 
 maximum listed in the Venting section of the 
  Installation and Operation Manual.

- Dirty/damaged burner.  

 • Refer to pages 26 and 27 in this manual for the burner   
   removal and inspection procedure.  Clean or replace the    
   burner as necessary.

- Low water flow through the heat exchanger.    • Refer to the Water Connections Section of the 

 

Installation and Operation Manual for 

  minimum flow rates.  Verify that the appliance is piped in 
  a primary/secondary fashion and that the appliance and 
  system pump are running on a call for heat.

- Air in the piping system.  

 • Properly purge all air from the piping system.

- Low system water pressure.  

 • Verify system pressure is a minimum of 12 PSI.

- Faulty pump relay.

 • Replace relay.

- Faulty pump.

 • Replace pump.

- Internal fault on control board.

•  Check fuse F5.

 
•  Replace main control board.

 Note:  Make sure the boiler pump horse power (hp) does   
   not exceed 1 hp.

-

 System pressure exceeds relief valve 

 setting.

 

• 

Lower the system pressure below the rating of 

  the supplied relief valve or replace the standard relief 
  valve with a higher rated valve up to the maximum 
  pressure of the heat exchanger.

 - Improperly sized expansion tank.

 • Install properly sized expansion tank.

 - Outlet water temperature in excess of 210°.

 • Check set point of temperature control.

 • Check temperature rise across heat exchanger.  Refer to 
 

the temperature rise chart in the Water 

 Connections Section of the Installation and Operation 
 Manual.

 Copper-fin II/IIE Boiler, Water Heater and Pool 

Service Manual