Dunkirk 95M-200 Control Manual And Troubleshooting Manual page 16

Boiler Not Firing And:
Control display blank
Display fi rst digit shows
0; last digits show 2 or
3-digit number (boiler
outlet water temp.)
Display fi rst digit shows number from 1 to 8; last digits show
2 or 3-digit number (boiler outlet water temp.)
Display fl ashes "9," then "b." Last two digits show code
number.
9 - TROUBLESHOOTING
Check For:
120 vac at terminals L1 and L2 of
line voltage strip?
120 vac on both sides of fuse F1?
(Turn OFF external power to boiler
before removing cover.
Wiring correct, in good condition,
and securely attached?
Room thermostat and DHW
aquastat satisfi ed?
Thermostat or aquastat calling for
heat but boiler not fi ring.
Step Corrective Actions:
1 NO - Check external line switch and fuse or breaker.
Determine if red light on line voltage monitor is fl ashing
indication fault. If there is fault verify input voltage dial
2 is properly set in accordance with steps in installation
manual. If fault does not clear after ten minutes replace
line monitor.
NO - Turn off power to boiler and replace fuse if
1 necessary. Inspect boiler interior wiring to determine
cause of fuse opening.
Correct if needed. Replace any damaged wiring or
1
components. Replace control module if problem persists.
YES - Boiler off, no call for heat. Turn up thermostat or
1
aquastat. Boiler should start.
Check voltage on both sides of low voltage fuse F3. (Turn
1 OFF external power before removing cover.) If necessary,
replace fuse. Determine reason for fuse failure if possible.
Check/set boiler parameters 2 and 3. Make sure space
2
heat or DHW is turned on. Turn on if necessary.
Turn off power to boiler. Temporarily jumper low voltage
terminal strip terminals T1 and T2 or DHW T1 and
3 DHW T2. Retry. If boiler operates, check CH and DHW
thermostat and wiring. Replace if necessary. Remove
temporary jumper(s).
Turn off power to boiler. Check wiring against wiring
4
diagram; verify all wiring in good condition and secure.
5 Replace wire harnesses and retry.
6 Replace control module.
1 Boiler in normal operating mode.
See User Interface Quick Reference and Soft Lockout
1
Troubleshooting for more information on soft lockout code.
16