Munchkin Fault Requiring Manual Reset - Munchkin T50M Installing, Operating & Maintaining

pre-purge or post purge cycle. This code will only appear 10 seconds after the fan starts. The
Temporary fault will only be displayed an additional 50 seconds before going into lock mode
(F15).
Remedy – Check the hose connection from switch to fan. Check to see if the inlet is
blocked. Check the air pressure switch contact. Adjust the switch, turn center screw
counter clockwise in ¼ turn increments until the switch clicks into closed position. Also
check to see if the fan is functional.
E16 This code will appear if the Air Pressure Switch is closed when the fan is switched on in the
pre-purge or post purge state. This code will only appear 10 seconds after the fan has start-
ed. The Temporary fault will only be displayed an additional 50 seconds before going into
lock mode (F16).
Remedy – Check the Air pressure switch for a possible adjustment. Adjust switch, turn
center screw clockwise in ¼ turn increments until the switch clicks into open position.
PR0 This code will appear if the Water Pressure Switch is open for more than 5 seconds. The unit
will not be allowed to operate while this code is on the display.
Remedy – Check the water pressure in the system. Make sure the pressure is at least 10
PSI. Check all electrical connections to the switch. If the switch still does not close, try
adjusting the switch with a screw driver and turn screw in center of the switch counter-
clockwise to close switch. If the switch still does not close with a minimum supply pressure
of 10 PSI, then replace the switch.
C. MUNCHKIN FAULT REQUIRING MANUAL RESET
When a fault condition occurs or is sensed on the Munchkin controller or in the appliance, the con-
troller goes into a lockout state. When in LOCKOUT state, the red led light will illuminate and a fault
code will be presented in the display. To reset the lockout condition, simply push the
bring the control out of its lockout state. If the problem is not corrected, the Munchkin will repeat the
fault until the condition is corrected. Once corrected, the display will resume its supply temperature
setting. Listed below are the Fault Codes and the remedies to correct the fault.
F00 Safety Limit ECO – This code appears if the Safety Limit ECO opens. The ECO will normally
open if it senses a temperature greater than 225 degrees.
Remedy – Let the unit cool down and push the reset button (S4). Determine if there is
water flow through the heater. Manually reset the unit by pushing the
the lockout continues, replace the switch to correct the problem.
F01 Safety Limit Flue – This code appears if the Safety Limit Flue senses a temperature higher
than 210 degrees.
Remedy – Push the red button down on the Flue sensor, then push the reset button on the
display. If you experience another F01 lock out code, replace the flue sensor, then try again.
Check to see that condensation line is not frozen. Manually reset by pushing the
button. If this problem persists, call factory for further assistance.
F02 Interrupted or Shorted Supply Thermister – This code appears if the Supply thermister
located on the Munchkin Outlet manifold has been interrupted or shorted.
Remedy – Check the wiring connection and connectors on the thermister. If the unit locks
out again, replace the Supply Thermister. Manually reset the unit by pushing the
button
F03 Interrupted or Shorted Return Thermister – This code appears if the Return thermister
located on the Munchkin Outlet manifold has been Interrupted or shorted.
Remedy – Check the wiring connection and connectors on the thermister. If the connection
is okay, hit reset
F05 Supply Temperature is to High – This code appears if the Supply temperature sensor
goes above 230 degrees.
Remedy – Let the Munchkin cool down, then manually push the reset button and see if the
S4/Reset . If the unit locks out again, replace the Return Thermister.
SERVICING
S4/Reset to
S4/reset button. If
S4/reset
S4/reset
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