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GAS-FIRED HEATER Installation Manual
A. MUNCHKIN ERROR CODE
An error code may occur in the installation of
the Munchkin Contender. This condition may
lead to a lock out condition of the controller,
which will need to be manually reset through
the S4/Reset button. These temporary codes
will help the installer correct the problem before
going into a lock out condition, which will
require a manual reset.
B. HEATER ERROR
1. When an error condition occurs the controller
will display an error code on the display
module.
2. These error codes and several suggested
corrective actions are included in Table 14-1.
3. In the case of E00, E13, and E14 this error, if
uncorrected, will go into a fault condition as
described is Paragraph C (Heater Fault).
C. HEATER FAULT
1. When a fault condition occurs the controller
will illuminate the red “fault” indication light
and display a fault code in the format
(Example: |F00|) on the display module.
2. Note the fault code and refer to Table 14-2 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 to prevent a recurrence
of the fault.
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.
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 heater damage. Instead, shut off the
gas supply to the heater at the gas service valve.
Table 14-1 : 925 Control Board ERROR Codes
WARNING
When servicing or replacing any components of this
heater be certain that:
• The gas is off.
• All electrical power is disconnected
WARNING
Do not use this appliance if any part has been under
water. Improper or dangerous operation may result.
Contact a qualified service technician immediately to
inspect the heater and to repair or replace any part of
the heater which has been under water.
DANGER
When servicing or replacing that are in direct contact
with the heater water, be certain that:
• There is no pressure in the heater. (Pull the release
on the relief valve. Do not depend on the pressure
gauge reading).
• The heater water is not hot
• The electrical power is off
Code Description Duration Corrective Action
E13
Combustion Fan Speed Low.The
heater combustion air fan speed less
than 70% of expected.
60 Sec.
1. Check the combustion air fan wiring.
2. Replace the combustion air fan.
3. Replace the control board.
E14
Combustion Fan Speed High. The
heater combustion air fan speed is
more than 130% of expected.
60 Sec.
1. Check the combustion air fan wiring.
2. Replace the combustion air fan.
3. Replace the control board.
PR0
Water Pressure Switch Open
Until
Corrected
1. Assure that the system pressure is above 10 psig.
2. Check for leaks in the system piping.
FLU
Blocked Vent Pressure Switch Open
Until
Corrected
1. Assure that the vent is not blocked
2. Check the switch operation by applying a jumper. (If
the switch is not functioning properly, replace it.)
PART 14: TROUBLESHOOTING