45
®
Troubleshooting
PROBLEM
POSSIBLE CAUSE
SUGGESTED ACTION
Oxygen display not
available.
No FMI board installed in option slot 2.
Probe calibration values not entered |
correctly.
Probe installed incorrectly.
Check for board installed.
Re-enter values (options 30.1, 30.2,
30.6).
Check wiring.
No inlet temperature
display.
No FMI board installed in option slot 2.
Option 36.0 has not been set.
Check for board installed.
Set to 1 or 2.
Inlet or flue temperature
display flashes “Hi”
No FMI board installed in option slot 2.
Option 36.0 has not been set.
Check for board installed.
Set to 1 or 2.
Inlet or flue temperature
display flashes "Hi"
Inlet air temperature sensor / O2 probe not
installed and wired correctly.
Check wiring to connector PN.
No efficiency display or
efficiency incorrect.
No oxygen display.
No inlet temperature display.
The burner is firing a multiple fuel combi-
nation?
No calorific value for the current fuel been
entered into 36.X?
Have flow values been entered for the cur-
rent fuel combination?
See ‘No oxygen display’
See ‘No inlet temperature display’
Efficiency cannot be calculated for mul-
tiple fuel combinations.
Enter the value for the fuel in use.
Enter the flow values.
Oxygen display
shows ‘---‘
Burner off.
Transport delay not expired.
Probe not heated up yet.
Not a fault.
Not a fault.
Check EK85 – must be above 600ºC to
work.
Oxygen trim will not
work
Trim is not operative.
Boiler just fired up.
Probe calibration values not entered cor-
rectly.
Probe not heated up yet.
Probe installed incorrectly.
Set to monitor only.
Probe in calibration.
Trim being reset.
Trim drive same as lead drive.
Trim limits set to 0.0% of flow.
Trim integral gain set to zero.
Commissioning data missing.
Use EK25 to decide if trim is operative.
If trim is not operative, use EK53 to find
out why.
Check that option 30.0 =1 or 2.
Wait for the boiler transport time (after
ignition). Wait for modulation.
Re enter values (options 30.1,30.2,30.6)
Check EK85 – must be above 600ºC to
work.
Check wiring.
Check option parameter 30.5 set to 1.
Check option parameter 30.6 set to 0.
Check option parameter 30.8 set to 0.
Check option parameters 7.X and 32.X
are different.
Check option parameters 33.X.
Check option parameters 34.X are non
zero.
Check oxygen and flow values been
entered for all profile points in the firing
range.
