12
Troubleshooting
(continued)
Table 12F
(continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface
Installation & Service Manual
73
FAULT
DESCRIPTION
CORRECTIVE ACTION
OUTLET ARHL
The outlet water temperature has exceeded
the setting of the automatic reset high limit.
• Adjust the set point of the auto reset limit to a higher
setting up to a maximum of 200°F. Reference Section
10 - Operating Information for adjusting procedures.
• Verify that the system is full of water and that all air
has been properly purged from the system.
• Verify that the water heater 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 water heater 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 water
heater pump is not operating, replace the pump.
• If operating on something other than an outlet sensor,
check temperature setting of the main control board.
• If the optional manual reset high limit has tripped,
check setting of the device.
• Check resistance of water sensors and compare to
Table 12C on page 70 of this manual. Replace
sensor if necessary.
• Check operation of diverter valve motor. Replace if
necessary.
AIR PRESSURE
SWITCH
(will require a manual
reset once the condition
has been corrected.
Press the RESET button
on the display to reset.)
Air pressure switch contacts are open.
• Check the wiring connections to switch. Wires should
be connected to the common and normally closed
terminals.
• Air intake lengths exceed the maximum allowed
lengths. Refer to Section 2 - General Venting
for proper lengths.
• Check for obstruction or blockage in the air
intake pipes or at terminations.
• Check reference hoses connected to the air pressure
switch for blockage or obstruction.
• Inspect the burner. Reference page 66 of this manual
for removal and cleaning procedures. Replace if
necessary.
• Inspect the heat exchanger. Reference page 66 of
this manual for removal and cleaning procedures.
• Faulty air pressure switch. Replace switch.
BLOCKED
DRAIN
Thermal fuse on heat exchanger has opened.
• Check the wiring connections to the fuse on the heat
exchanger.
• Check continuity across the thermal fuse. If open,
replace heat exchanger.
AUX LIMIT
FAULT
Aux limit device open.
• Check wiring to aux limit device.
• Check aux limit device.
Содержание Shield SWA150
Страница 53: ...53 Figure 9 2 Operating Instructions Models 125 285 9 Start up continued Installation Service Manual ...
Страница 54: ...54 Figure 9 3 Operating Instructions Models 400 500 9 Start up Installation Service Manual ...
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Страница 84: ...Revision Notes Revision A PCP 3000038210 CN 500026403 initial release MM 100329111_DIR 2000585724 Rev A 04 20 ...