Troubleshooting
30
Diagnosis (continued)
Diagnostics table: Faults with fault display on control unit
Fault message in display window
Burner System behavior
fault indicator (red)
Control unit for
weather-responsive operation with
programming unit
FAULT:
OUTDOOR TEMP. SENSOR
OFF Boiler operates based on 32 ºF/0 ºC outdoor temperature.
FAULT:
OUTDOOR TEMP. SENSOR
OFF Boiler operates based on 32 ºF/0 ºC outdoor temperature.
FAULT:
SUPPLY TEMP. SENSOR
OFF Supply temperature of heating circuits too low.
FAULT:
SUPPLY TEMP. SENSOR
OFF Supply temperature of heating circuits too low.
FAULT:
BOILER TEMP. SENSOR
OFF Boiler cools down.
FAULT:
BOILER TEMP. SENSOR
OFF Boiler cools down.
FAULT:
SUPPLY TEMP. SENSOR
OFF Mixing valve is opened.
FAULT:
SUPPLY TEMP. SENSOR
OFF Mixing valve is closed.
FAULT:
TANK TEMP. SENSOR
OFF DHW tank cools down.
FAULT:
TANK TEMP. SENSOR
OFF DHW tank cools down.
FAULT:
EXT.PROG.2
ON Boiler cools down
5285 961 v1.35285 961 v1.3
Control unit for weather-responsive operation
with programming unit
Burner
fault indicator
Display window
Reset button
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