58
GAS-FIRED BOILER Boiler Manual
A. MOD CON ERROR CODE
If any of the sensors detect an abnormal condi-
tion or an internal component fails during the
operation of the ModCon Boiler, the display may
show an error code. This code may either be the
result of a temporary condition in which case
the display will revert to its normal readout
when the condition is corrected or it may be the
result of a condition that the controller has eval-
uated as not safe to restart the boiler. In this
case, the boiler control will be locked out,
requiring the maintenance person to manually
reset the control by pressing the {S4/RESET} but-
ton for more than 1 second. Typically, if the dis-
play has a code beginning with F followed by 2
numbers the ModCon Boiler is locked out. If the
display has a 3 letter code it is the result of a
temporary condition.
B. BOILER ERROR
When an error condition occurs, the controller
will display an error code on the display module.
These error codes and several suggested cor-
rective actions are included in Table 12-1.
C. BOILER FAULT
1. When a fault condition occurs the controller
will illuminate the red “fault” indication light
and display a fault code in the format. The
alarm output will also be activated. Most fault
conditions will also cause the CH pump to
run in an attempt to cool the boiler.
2. Note the fault code and refer to Table 12-2 for
an explanation of the fault code along with
several suggestions for corrective actions.
3. Press the reset key to clear the fault and
resume operation. Be sure to observe the
operation of the unit for a period of time to
assure correct operation and no re-
occurrence of fault codes.
n
CAUTION
This appliance has wire function labels on all internal
wiring. Observe the position of each wire before re-
moving it. Wiring errors may cause improper and dan-
gerous operation. Verify proper operation after servicing.
n
CAUTION
If overheating occurs or the gas supply fails to shut
off, do not turn off electrical power to the circulating
pump. This may aggravate the problem and increase
the likelihood of boiler damage. Instead, shut off the
gas supply to the boiler at the gas service valve.
n
WARNING
When servicing or replacing any components of this
boiler be certain that:
• The gas is off.
• All electrical power is disconnected
n
WARNING
Do not use this appliance if any part has been under
water. Improper or dangerous operation may result.
Contact a qualified service technician to inspect the
boiler and to repair or replace any part of the boiler
that has been under water prior to placing the boiler
back in operation.
n
DANGER
When servicing or replacing components that are in
direct contact with the boiler water, be certain that:
• There is no pressure in the boiler. (Pull the release
on the relief valve. Do not depend on the pressure
gauge reading).
• The boiler water is not hot
• The electrical power is off
PART 12: TROUBLESHOOTING
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