UTICA BOILERS 95M-200 Control Manual And Troubleshooting Manual page 19

HARD LOCKOUT (Display flashes first 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
Casting temperature switch opened.
12
13 internal control failure.
thru
17
18 Thermal Overrun Condition: outlet
water temp. above 200 °F
19 Thermal Overrun
Return water temp. above 190 °F
28 Blower not running.
29 Blower signal not 0 when it should
be.
Temp difference between supply & return,
30
indicated by blocking code b30, was
too large for 20 successive times. Non
adjustable default Max Delta set to 100°F
Outlet water temp. short circuit.
31
Return water temp. short circuit.
32
Supply water temp. sensor open
36
circuit.
Return water temp. sensor open
37
circuit.
44 internal control failure.
60
61
Blower signal too low (not enough
65
driving force).
VIII - TROUBLESHOOTING
Corrective Actions (pressing RESET should restart boiler immediately):
Reset control and retry. If problem persists, replace control module.
1
Determine reason for limit action and correct. Check for air trapped at top of casting.
1
If limits are closed, check wiring and connections. Apply a temporary jumper across
2
terminals 6 and 8 and check operation. If problem persists, check boiler internal
wiring. Replace low voltage harness if necessary. Replace control module if harness
replacement doesn't resolve.
Reset control and retry. If problem persists, replace control module.
1
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 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.
1 See Code 18, Corrective Action#1 (above).
Condition:
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.
Turn off power to boiler. Remove line voltage connector at blower. Restart boiler
1
and check voltage across blower plug terminals. If 120 vac is NOT 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 problem
2
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.
Inspect supply & return water sensors for proper resistance.
1
Inspect piping for proper configuration. For example, when used in a radiant
2
heating application.
Inspect outlet water temp. sensor and wiring. Replace sensor if wiring correct and
1
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 and
1
in good condition. Replace low voltage wiring harness if problem persists. Replace
control module if harness replacement doesn't resolve.
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.
1
Inspect wiring and connections. If wiring is correct, replace blower assembly. If
1
blower assembly replacement is unsuccessful, replace control module.
19