Instruction Manual

17
SOFT LOCKOUT (Display ashes “9” and then “b” in rst position; last two digits on steady (code))
Code Reason For Soft Lockout Corrective Actions (pressing RESET should restart boiler immediately):
08
0.14” Pressure switch contacts
open
1
Check pressure switch for proper operation. Replace pressure switch if moisture has
entered switch. Check venting for blockage. Clear if present.
18
High Limit Operation: Burner
off until outlet water temperature
drops below 180 °F
1
Happen when heat demand is lower than lowest ring rate of boiler, such as
operation of single, small zone. Check system for:
• Verify boiler and system are full of water.
• Verify system does not have trapped air.
• Inspect and verify system piping and components.
• Verify piping agrees with boiler manual recommendations.
2
Use contact thermometer to check outlet water temp. Compare to temperature
shown with display in “INFO” mode (“1” in rst digit). Replace return temperature
sensor if results are not close. Replace control module if sensor replacement doesn’t
solve problem.
19
High Limit Operation: Burner
off until return water temp. drops
below 190 °F
1
Check system for:
• Verify boiler and system are full of water.
• Verify system does not have trapped air.
• Inspect and verify system piping and components.
• Verify water ow is not reversed or pipes crossed.
2
Use contact thermometer to check return water temp. Compare to temperature
shown with display in “INFO” mode (“2” in rst digit). Replace return temperature
sensor if results are not close. Replace control module if sensor replacement doesn’t
solve problem.
24
High Limit Operation: Return
temp. is higher than supply temp.
1
• Verify boiler and system are full of water.
• Verify system does not have trapped air.
• Inspect and verify system piping and components.
• Verify water ow is not reversed or pipes crossed.
2
Use contact thermometer to check return water temp. Compare to temperature
shown with display in “INFO” mode (“2” in rst digit). Replace return temp. sensor
if results are not close. Replace control module if sensor replacement doesn’t solve
problem.
25
High limit operation: Outlet
water temp. increased too quickly.
Non-adjustable default setting
9.8°F/sec
1
Indicates ow rate too low. 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.
2
Verify operation of boiler circulator:
• Check voltage at circulator junction box to ensure 120 vac when boiler
operates. If no voltage, check wiring and wiring connections.
• High voltage terminal strip terminals 5 and 6 should show 120 vac for space
heating; terminals 3 and 4 should show 120 vac for DHW. Replace circulator if
powered but not operating.
• Replace line voltage wire harness if necessary. Replace control module if wire
replacement doesn’t resolve.
26
Aquastat contacts open
or
LWCO contacts open
or
3.5” Switch open
1
Verify proper setting of control.
Water temp too high, wait for temperature to drop below 180 degrees.
2
Check water level in boiler, ll if low.
Press LWCO reset switch on display panel
If problem still exists, check LWCO probe and board according to manufacturer’s
instructions. Replace if necessary.
3
Check pressure switch for proper operation. Replace if moisture has entered switch.
Check venting for blockage. Clear if present.
9 - TROUBLESHOOTING