Bosch Heatronic 4000 Installation & Operating Instructions Manual page 55

Error Messages (2 of 3)
Error Message
BOILER (#) OUTLET SENSOR MAXIMUM EXCEEDED
The boiler outlet (#) temperature exceeded the Maximum Outlet
temperature. As a result, the control stops operation for the
associated boiler. The error message self clears once the error
condition is cleared.
BOILER INLET SENSOR ERROR
OPEN or SHRT displays on the screen.
Due to an open or short circuit, the control failed to read the
boiler inlet sensor. The control operates normally while the error
message is present. The error message self clears once the
error condition is corrected.
PRIMARY PUMP P1 FLOW PROOF FAILURE
The primary pump P1 has failed. Once the primary pump 1 relay
closed, a primary pump flow proof was call not detected before
the flow proof delay time elapsed.
PRIMARY PUMP P2 FLOW PROOF FAILURE
The primary pump P2 has failed. Once the primary pump 2 relay
closed, a primary pump flow proof was call not detected before
the flow proof delay time elapsed.
PRIMARY PUMP P1 & P2 FLOW PROOF FAILURE
Both the primary pump P1 & P2 have failed.
PRIMARY PUMP FLOW PROOF ERROR
The primary pump has been turned off but the primary pump
flow proof remains detected after 4 minutes.
COMBUSTION AIR PROOF FAILURE
The combustion air damper has failed. The Comb Air (Aux) relay
closed, but the control did not detect a Comb Air Proof before
the C.A. proof delay time elapsed.
COMBUSTION AIR PROOF CALL ERROR
The combustion air damper has been turned off but the Comb
Air Proof remains detected after 4 minutes.
COMMON FLUE MAXIMUM EXCEEDED
The Common Flue Sensor temperature has exceeding the
FLUE MAX setting. As a result, the control stops operation for
the entire plant.
NO HEAT ALERT
The boiler supply temperature did not increase within the boiler
alert time. The control operates normally while this Alert is
present. To reset the Alert, press the 'CLEAR' button while
viewing this warning message.
BTC461503101C | 6720810369 (2018/03)
Description
55 of 60
Troubleshooting Tips
BOILER (#) OUTLET TEMP
EXCEEDS MAX OUT SETTING
CHECK BOILER INLET SENSOR,
CHECK BOILER INLET SENSOR
WIRING
CHECK FLOW PROVING DEVICE,
CHECK FLOW PROVING DEVICE
WIRING
CHECK FLOW PROVING DEVICE,
CHECK FLOW PROVING DEVICE
WIRING
CHECK FLOW PROVING DEVICE,
CHECK FLOW PROVING DEVICE
WIRING
CHECK FLOW PROVING DEVICE,
CHECK FLOW PROVING DEVICE
WIRING
CHECK CA PROVING DEVICE,
CHECK CA PROVING DEVICE
WIRING
CHECK CA PROVING DEVICE,
CHECK CA PROVING DEVICE
WIRING
COMMON FLUE TEMP EXCEEDS
MAX SETTING
NO CHANGE IN SUPPLY TEMP
WITHIN SPECIFIED PERIOD OF
TIME
Heatronic 4000