Fault Finding - Mikrofill Ethos 28 Series Installation And Operating Manual

Table 17 LCD ' Non Flashing' - burner off
Status Display messages ' Non Flashing' with the burner off
MAXIMUM WATER TEMP
FAN OFF-ON
FAN TOO LOW
FLAME IDENTIFICATION
BLEED

33. Fault Finding

.
Fault Indicator (flashing display)
To a certain extent the boiler will attempt to automatically overcome some of the faults
that occur.
For example, it will attempt 4 ignition sequences before going to lock out.
In situations where it has not been successful, the boiler will lock out and can only be re -
started by pressing the manual (Red) reset button.
When in lock out mode, the error is displayed in the LCD display as a flashing message.
The following list indicates the messages shown and the descriptions of the faults. The
numbers shown in the left hand column , suggest the possible cause.
By using the numbered lists attached, the cause of the fault can be quickly identified and
a repair effected.
Table 18 Fault Display Flashing
Display message
FLASHING
STB- supply
STB- fluegas
Fanspd high
Fanspd low
Ignit fault
No flame
False flame
S1 disconnect
S3 disconnect
S4 disconnect
S7 disconnect
Program end
Gasvalve
The boiler water temperature has reached
the set point
The fan has switched off. Unit will try to reset
automatically.
Detected fan speed to low. Unit will try to
reset automatically.
Check wiring terminals on top of transformer
Flame detected. . Unit will try to reset
automatically.
Boiler going through automatic venting cycle
Type of fault
Maximum flow temperature
has been reached
Maximum flue gas
temperature has been
reached
Fan speed is too high
Fan speed is too low
No flame after 4 attempts
Flame failed during
operation
False flame detection
Sensor or cable interrupted
Sensor or cable interrupted
Sensor or cable interrupted
Sensor or cable interrupted
Sensor or cable interrupted
No phase connection for
gas valve
Check table
row number
2,4,5,21,23,24,29,30
4,5,23,24,29,33
7,8,9,39,40
7,8,9,39,40
10,11,16,18,22,25
11,12,16,22,25,2632,44
18,35
3,41,42,43
3,41,42,43
3,41,42,43
3,41,42,43
3,41,42,43
34,20