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

- No 120 VAC supplied to unit.    

•  Check external line switch, fuse, or breaker.

•  Check position of ON/OFF switch. Turn switch to the 
   ON position.

• Check 120 VAC through the ON/OFF switch.  No 
  voltage through switch, replace switch.

- Bad wiring connection.

•  Check wiring harness connection between the display 
  board and the main control board.  Connect the harness 
  at both points.

- Blown fuse.  

• Replace fuse F6 on the main control board, see 

 

 

 

 

 

   

  FIG. 3-1 on page 31 of this manual.

- Bad display board.  

•  Replace board.

- Bad main control board. 

•  Replace main control board.

- Main control board temperature set point 
 satisfied.

•  Review temperature setting.

- Remote thermostat satisfied.  

•  Review remote thermostat setting.

- 

Outside air temperature above Warm 

  Weather Shutdown (WWSD) set point for 
  main control board.  

• Check location of outside air sensor.  Check 
  resistance of outdoor air sensor and compare to Table 
  3D on page 33 of this manual.

- Unit locked out on fault.  

• Consult display for specific fault.  Refer to fault 
  descriptions on pages 35 - 42 of this manual for 
 corrective 

actions.

- Ramp delay active.  

• Check ramp delay parameter settings.  Optional PC 
  software required.  

•  Turn ramp delay feature off.  See page 18 of this 
  manual for instructions on how to turn this feature off.

- Boiler controlled by BMS.  

• Check BMS parameter settings.  Optional PC 
 software 

required.

- Outlet temperature too high.  

- Delta T too high.  

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

Service Manual