53
Energy Technology
Ltd.
21.1 screen display
diagnosis of faults
STATUS MESSAGES (FLASHING DISPLAY) INDICATING A FAULT
A flashing display indicates a fault and that the boiler has shutdown (lockout). The boiler will not attempt to operate until
the red’ reset button is pressed.
Any repetitive flashing fault message should be investigated, the cause found and corrective action taken.
For each flashing display message there is a possible cause, see list of cause numbers following the flashing status’ list.
DISPLAY MESSAGE FLASHING MEANING CAUSE NUMBER/S
Wat 1 Lockout Lower ht/exch high limit stat 5,6,7,8,21,24,25,26,31
has tripped.
Wat 2/Flue Lo Upper ht/exch high limit or flue 2,5,6,7,8,21,24,25,26,31
limit stat has tripped
Fan 1 High Lower burner fan speed is too high 9,11,29,31,33
Fan 1 Low Lower burner fan speed during 9,10,11,14,18,29,31,33
pre-purge is too low
Fan 1 oper Lower burner fan is detected as 3,4,11,29,31
operating when should be idle
Ignit 1 fault Ignition to lower burner has not 12,13,15,16,17,19,22
been successful after 4 attempts 23,27,29,30,31,35
Flame 1 out Flame at lower burner has been lost 13,15,17,19,20,23
on 4 consecutive occasions during
operation
Flame 1 on w/ Flame is detected at the lower burner 17,19,30
when there should be no flame
S1 interrupt Lower ht/exch flow temperature 3,5,33
sensor interrupted
S3 Upper ht/exch flow temperature 3,5,33
sensor interrupted
S4 Return temperature sensor 3,5,33
Interrupted
S7 Mixed flow temperature sensor 1,3,5,33
Interrupted. Only when MR03
Unit installed
Program end Follows reprogramming of control
panel with laptop PC, not a fault
-just press reset button
Fan 2 High Upper fan speed too high 9,11,29,31,33