63
®
TROUBLESHOOTING
Display Problem
Start-up Problem
PROBLEM
POSSIBLE CAUSE
SUGGESTED ACTION
Display will not light.
Display shows garbage.
Keys do not work.
Display wired incorrectly.
Check wiring to connector PE.
Display will not light.
Fuse blown on backplane board.
Check fuse. If blown, investigate all external wiring and
replace fuse with a new one of the correct type and rat-
ing.
Drive positions incorrect.
Wrong potentiometer voltage
Incorrect potentiometer wiring.
Check POT SUPP link (refer to POT supply, page 21).
Check wiring to terminals PD11-17.
Measured value incorrect.
Wrong sensor voltage.
Wrong sensor input type.
Incorrect sensor wiring.
Wrong zero or span.
Setpoint 1 or 2 incorrectly selected
Check SENS SUPP link (see option link section).
Check SENS IN link (see option link section).
Check wiring to terminals PE 20 -23
Check option parameters 6.1, 6.2, 8.1, 8.2.
Check EK17 and select other setpoint.
Setpoint incorrect.
Setpoint 1 or 2 incorrectly selected
Option params 6.3/8.3 incorrect.
Value updated via serial comms
Check EK17 and select other setpoint.
Enter option set mode and change values.
Change setpoint using ComFire software.
Hours run shows ‘---’.
Hours run keeps toggling.
No profile selected.
Hours run > 999 hours.
Select oil or gas profile.
1st digits show thousands, 2nd show units.
Modulation rate is 0.
Burner not modulating.
Wait for burner to finish start-up sequence.
Burner status is flashing.
Unit in safety shutdown mode.
Burner status before shutdown displayed.
Gas pressure not shown.
Gas sensor not selected.
Select sensor using option parameter 02.0.
Gas pressure incorrect.
Wrong zero or span.
Check option parameters 2.1 and 2.2.
PROBLEM
POSSIBLE CAUSE
SUGGESTED ACTION
Burner will not start.
Unit in safety shutdown.
Air pressure switch still made.
No fuel selected.
Burner not selected.
High control limit exceeded.
Unit in commission ratio mode.
Burner off via serial comms.
Hold FAULT MUTE key when faults clear.
Wait for burner fan to stop.
Check EK1 (oil input) and EK2 (gas input).
Check EK11 (burner select input).
Check EK18 and wait for press/temp to drop.
Press NEXT to advance to next setpoint.
Turn burner on using ComFire software.
Drive positioning fault
occurs before drives move
to purge.
Stored close positions do not match actual
close positions.
Check feedback potentiometers and servo-motor micro-
switches. Reset close positions using commission ratio
Drive positioning fault
occurs when drives reach
purge.
Stored purge positions do not match actual
purge positions.
Check feedback potentiometers and servo-motor micro-
switches.
Reset purge positions using commission ratio
Pilot, main 1 and main 2
valves will not open.
No feed on BURNER SEL.
Check terminal PB7.
Ignition transformer does
not energize.
No output on IGN.
Check terminal PB6.
Drives stuck at ignition and
burner has not fired.
Drives cannot reach ignition pos.
Valve proving in progress.
Check servo-motor micro-switches and linkages.
Wait for proving sequence to finish.
Drives stuck at ignition and
burner has fired.
Ignition time has not elapsed.
Wait for ignition time to elapse.
Reduce ignition time (option parameter 4.1).
