Naboo - How do you solve the error message “A26 boiler 2 burner alarm”?

A26 Burner alarm boiler 2 warns about a wrong/missing RPM signal from boiler 2 blower. As consequence unit stops the burner function an related cooking. 

This message requires the intervention of an authorized technician; causes of the fault must be investigated as per prescriptions.

Description

 The blower is driven by the frequency signal generated by the gas plug-in; if, within a time window, this signal is not corresponding with frequency signal generated by the blower the message appears. 

Reset

Error reset with a long press on the top bar of error message window. 

Checks

 Perform following checks: 

  1. Check basic conditions.
  2. Check constant power supply to the blower (230V)
  3. Check proper connection between blower and plug in.
  4. Check proper insertion of Gas Plug-In gas sulla PCB I/O
  5. Check from service level – burner management – burner boiler 2: 
    1. If blower spin and if not exchange it
    2. If RPM settled have corrispondence ti gas tables
    3. If blower spin but do not reach settled RPM, check blower, power supply during spinning and in case exchange it
    4. If there is dust or somesing capable to block/slowdown the system
  6. If after changing the blower issue will stay change the gas plug-in.
  7. If all checks are positive (1-5) and replacement step 6 do not solve, change I/O PCB and configure the system.