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Boiler Not Firing And:
Control display blank
Display first digit shows 0; last
digits show 2 or 3-digit number
(boiler outlet water temp.)
Display first digit shows a number from 1 to 8; last digits show 2 or
3-digit number (boiler outlet water temp.)
Display flashes "9," then "b." Last two digits show code number.
SOFT LOCKOUT (Display flashes "9" and then "b" in first position; last two digits on steady (code))
Code
Reason For Soft Lockout
WARNING: Electrical shock hazard. Turn off power to boiler when working with wiring or replacing any boiler component.
0.14" Pressure switch contacts open
08
18
High Limit Operation: Burner off
until outlet water temp. drops below
180 °F
19
High Limit Operation: Burner off
until return water temp. drops below
190 °F
VIII - 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
aquastat satisfied?
Thermostat or aquastat calling for
heat but boiler not firing.
Corrective Actions (pressing RESET should restart boiler immediately):
Check pressure switch for proper operation. Replace pressure switch if moisture
1
has entered switch. Check venting for blockage. Clear if present.
This should only happen when the heat demand is lower than the lowest firing rate
1
of the boiler, such as operation of a single, small zone. Check system for:
•
Verify boiler and system are full of water.
•
Make sure system does not have trapped air.
•
Inspect and verify system piping and components.
•
Verify piping agrees with boiler manual recommendations.
Use contact thermometer to check outlet water temp. Compare to temp. shown with
2
display in "INFO" mode ("1" in first digit). Replace return temp. sensor if results are
not close. Replace control module if sensor replacement doesn't solve problem.
Check system for:
1
•
Verify boiler and system are full of water.
•
Make sure system does not have trapped air.
•
Inspect and verify system piping and components.
•
Make sure water flow is not reversed or pipes crossed.
Use contact thermometer to check return water temp. Compare to temp. shown with
2
display in "INFO" mode ("2" in first digit). Replace return temp. sensor if results are
not close. Replace control module if sensor replacement doesn't solve problem.
Step
NO - Check external line switch and fuse or breaker.
1
NO - Turn off power to boiler and replace fuse if necessary.
1
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.
DHW
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.
1
(Turn 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
3
terminal strip terminals T1 and T2 or DHW T1 and
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.
Replace control module.
6
Boiler in normal operating mode.
1
1
see User Interface Quick Reference and Soft Lockout
Troubleshooting in this manual for for more information
on the soft lockout code.
16
Corrective Actions:
Hide quick links:
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