Dunkirk 95M-200 Control Manual And Troubleshooting Manual page 20

HARD LOCKOUT (Display fl ashes fi rst digit "E" and last two digits (code))
Code Reason For Hard Lockout
WARNING: Electrical shock hazard. Turn off power to boiler when working with wiring or replacing any boiler component.
09
Internal control failure.
11
12 Casting temperature switch opened.
13 -
Internal control failure.
17
Thermal Overrun Condition:
18
Outlet water temp. above 200 °F
Thermal Overrun Condition:
19
Return water temp. above 190 °F
28 Blower not running.
Blower signal not 0 when it should
29
be.
Temp difference between supply
& return, indicated by blocking
30 code b30, was too large for 20
successive times. Non adjustable
default Max Delta set to 100°F
31 Outlet water temp. short circuit.
32 Return water temp. short circuit.
Supply water temp. sensor open
36
circuit.
Return water temp. sensor open
37
circuit.
44
60
Internal control failure.
61
Blower signal too low (not enough
65
driving force).
9 - TROUBLESHOOTING
Corrective Actions (pressing RESET should restart boiler immediately):
1 Reset control and retry. If problem persists, replace control module.
Determine reason for limit action and correct. Check for air trapped at top of
1
casting.
If limits are closed, check wiring and connections. Apply a temporary jumper
across terminals 6 and 8 and check operation. If problem persists, check boiler
2
internal wiring. Replace low voltage harness if necessary. Replace control
module if harness replacement doesn't resolve.
1 Reset control and retry. If problem persists, replace control module.
Check system for:
Verify boiler and system are full of water.
1 Make sure system does not have trapped air.
Inspect and verify system piping and components.
Make sure water fl ow is not reversed or pipes crossed.
Use contact thermometer to check outlet water temp. Compare to temp.
shown with display in "INFO" mode ("1" in fi rst digit). Replace return temp.
2
sensor if results are not close. Replace control module if sensor replacement
doesn't solve problem.
1 See Code 18, Corrective Action#1 (above).
Use contact thermometer to check return water temp. Compare to temp.
shown with display in "INFO" mode ("2" in fi rst digit). Replace return temp.
2
sensor if results are not close. Replace control module if sensor replacement
doesn't solve problem.
Turn off power to boiler. Remove line voltage connector at blower. Restart
boiler and check voltage across blower plug terminals. If 120 vac is NOT
1 present, inspect wiring and tightness of connections. Replace line voltage
wire harness if necessary. Replace control module if wire harness replacement
doesn't resolve.
If 120 vac is present on blower wire harness, replace harness and retry. If
2
problem persists, replace blower motor.
Inspect wiring and connections. If wiring is correct, replace blower assembly. If
1
blower assembly replacement is unsuccessful, replace control module.
1 Inspect supply & return water sensors for proper resistance.
Inspect piping for proper confi guration. For example, when used in a radiant
2
heating application.
Inspect outlet water temp. sensor and wiring. Replace sensor if wiring correct
1 and in good condition. Replace low voltage wiring harness if problem persists.
Replace control module if harness replacement doesn't resolve.
Inspect return water temp. sensor and wiring. Replace sensor if wiring correct
1 and in good condition. Replace low voltage wiring harness if problem persists.
Replace control module if harness replacement doesn't resolve.
1 See Corrective Action# 1 under Code 31 (above)
1 See Corrective Action# 1 under Code 32 (above)
1 Rest control and retry. If problem persists, replace control module.
Inspect wiring and connections. If wiring is correct, replace blower assembly. If
1
blower assembly replacement is unsuccessful, replace control module.
20