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Part number 550-100-260/0520
124
ECO
®
Tec
GAS-FIRED WATER BOILER – 80/110/150/199 BOILER MANUAL
Troubleshooting (continued)
Troubleshooting suggestions —
Warnings
Display Condition Diagnostics Corrective Action(s)
Supply Sensor Occurs when Supply Sensor
are chosen as the Target
Modulation sensors and
the Boiler In sensor is either
open or short.
Clears warning when a valid
sensor is detected.
Check all the temperature readings of the boiler on the
DIAGNOSTICS - TEMPERATURES menu to determine if
any sensors are currently displayed as SHORT or OPEN.
Compare this to the boiler temperatures recorded in
the DIAGNOSTICS - ERRORS - LOCKOUT HISTORY # -
TEMPERATURES during the last several lockout conditions.
Determine which sensors are suspect and measure their
resistance value and compare it to the values shown in
Figure101,page115. If the resistance values are incorrect
replace the temperature sensor. Refer to repair parts section
for proper part number.
Check wire harness for loose connections and pin
engagement at sensor connection, chassis mount
connection through control housing, and the control.
Unplug connection at sensor and at control and check
continuity between ends.
If problem persists after checking Items above, replace
control. Refer to repair parts section for kit number.
Return Sensor Occurs when Return Sensor
are chosen as the Target
Modulation sensors and the
Boiler out sensor is either
open or short.
Clears warning when a valid
sensor is detected.
Check all the temperature readings of the boiler on the
DIAGNOSTICS - TEMPERATURES menu to determine if
any sensors are currently displayed as SHORT or OPEN.
Compare this to the boiler temperatures recorded in
the DIAGNOSTICS - ERRORS - LOCKOUT HISTORY # -
TEMPERATURES during the last several lockout conditions.
Determine which sensors are suspect and measure their
resistance value and compare it to the values shown in
Figure101,page115. If the resistance values are incorrect
replace the temperature sensor. Refer to repair parts section
for proper part number.
Check wire harness for loose connections and pin
engagement at sensor connection, chassis mount
connection through control housing, and the control.
Unplug connection at sensor and at control and check
continuity between ends.
If problem persists after checking Items above, replace
control. Refer to repair parts section for kit number.
DHW Outlet Sensor *Combi Only*
The DHW Outlet sensor read
invalid.
Clears warning when DHW
Outlet sensors both read as
valid.
Check all the temperature readings of the boiler on the
DIAGNOSTICS - TEMPERATURES menu to determine if
any sensors are currently displayed as SHORT or OPEN.
Compare this to the boiler temperatures recorded in
the DIAGNOSTICS - ERRORS - LOCKOUT HISTORY # -
TEMPERATURES during the last several lockout conditions.
Determine which sensors are suspect and measure their
resistance value and compare it to the values shown in
Figure101,page115. If the resistance values are incorrect
replace the temperature sensor. Refer to repair parts section
for proper part number.
Check wire harness for loose connections and pin
engagement at sensor connection, chassis mount
connection through control housing, and the control.
Unplug connection at sensor and at control and check
continuity between ends.
If measured resistance values of sensors convert to
temperatures separated by more than 10°F replace the
sensor.
If problem persists after checking Items above, replace
control. Refer to repair parts section for kit number.
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