Install Instructions

67
12 Troubleshooting (continued)
Table 12E (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Water Heater
Interface
Installation & Service Manual
ERROR CODE DESCRIPTION CORRECTIVE ACTION
E13
The flue temperature has exceeded 250°F.
• Inspect the heat exchanger. Reference page 58 of
this manual for the procedure on how to clean the flue
side of the heat exchanger.
• Inspect the flue sensor and associated wiring.
Measure the resistance of the flue sensor and
compare to Table 12C on page 62 of this manual.
Replace the sensor if necessary.
• Verify that the vent/air intake pipes are properly
installed and that there are no obstructions.
• Replace the main control board.
b05
The flue temperature has exceeded 240°F.
n04
The fan speed is being limited due to the flue
temperature exceeding 215°F.
E15
(will require a manual
reset once the condition
has been corrected.
Press the RESET button
on the
display to reset.)
The outlet water temperature has exceeded
the 210°F manual reset high limit (MRHL)
setting.
• Verify that the system is full of water and that all air
has been properly purged from the system.
• Verify that the boiler is piped properly into the heating
system. Refer to Section 5 - System Piping
for the proper piping methods for the Shield water
heater.
• Check 120 vac to pump motor on a call for
heat. If voltage is not present, check wiring back to
the main control board.
• Replace the main control board if necessary.
• If 120 vac is present on a call for heat and the boiler
pump is not operating, replace the pump.
• If operating on something other than an outlet sensor,
check temperature setting of the main control board.
• Check resistance of water sensors and compare to
Table 12B on page 62 of this manual. Replace
sensor if necessary.
b03
The outlet water temperature has exceeded
195°F.
n02
The fan speed is being limited due to the
outlet temperature exceeding 185°F.
E18
(will require a manual
reset once the condition
has been corrected.
Press the RESET button
on the display to reset.)
The control module reads an excessive
temperature difference between the two
outlet sensors.
• Check wiring to sensor. Make sure wiring is
connected and not damaged. Reconnect / repair
wiring if necessary.
• Measure the resistance of the sensor and compare
to the resistance in Table 12B on page 62 of this
manual. Replace sensor if necessary.
• Replace control module.
E19
(will require a manual
reset once the condition
has been corrected.
Press the RESET button
on the display to reset.)
One or both of the flue sensors is open or
shorted.
• Inspect the flue sensor and associated wiring.
Measure the resistance of the flue sensor and
compare to Table 12C on page 62 of this manual.
Replace the sensor if necessary.
• Replace the main control board.