Error Report - A.O. Smith Upsilon Installation And Service Manual

14 Error report
OpenTherm error mes-
sages
The coding of the trans-
mitted Error Messages
on a OpenTherm con-
troller is displayed as
follows:
(E) EB (E = Error Code =
B and boiler number)
example: Error Code
Ex02SC02 on boiler 6
will appear as (0) 26
Block.
B000sc00
Error
E000sc00
Message
M000sc00
* When this code is shown with an M instead of a B or E then a reset with the reset button is possible.
On the display, errors found are shown in the form of a message or blocking on a blue
screen or an error on a red screen.
- Blocking This is a temporary error that will sort itself out, or it will block the
boiler after several attempts (error)(Except: Bx01sc01 = reset)
- Error
Error implies a blocking of the boiler and can only be solved by a
reset and/or intervention of a service engineer.
- Message Implies a message such as low water pressure, but the device will
remain operational.
Point of attention requiring short-term intervention.
The code consists of a Main Code and a Subcode
Main code Blocking
Main code Error
Main code Message
Followed by a character
Subcode always starts with sc
Bx01sc01 Fan does not run on correct speed (Reset necessary). Fan defective.
Bx03sc01* Flow sensor T1 open
Bx03sc02* Flow temperature T1 too high
Bx03sc03* Flow sensor T1a open
Bx03sc04* Flow temperature T1a too high
Bx05sc01* Return sensor T2 open
Bx05sc02* Return temperature T2 too high
Bx08sc01* General purpose contact open
Bx12sc01* Water pressure sensor open
Bx12sc02* Water pressure sensor closed
Bx12sc03* Water pressure lower than 0.7bar. Top up
Bx12sc04* Water pressure too high. Decrease pressure
Bx12sc05* No pressure increase on pump start
Bx13sc01* DT between T1 and T2 too high
Bx15sc01* Communication error between controls
Ex01sc01* Fan does not run on correct speed. Fan defective.
Ex02sc01* No flame after 4 start attempts
Ex02sc02* Insufficient ionisation
Ex04sc01* Flow temperature T1 too high
Ex04sc02* Flow sensor T1 closed
Ex04sc03* Flow temperature T1a too high
Ex04sc04* Flow sensor T1a closed
Ex06sc01* Return temperature T2 too high
Ex06sc02* Return sensor T2 closed
Ex18sc01* Unwanted flame forming
Ex14sc01* DT not fast enough
Ex14sc02* DT between T1 and T2 > 35°C
M024sc01 DHW sensor T3 open (when P122=1)
M024sc02 DHW sensor T3 closed (when P122=1)
M024sc03 Outside sensor T4 open
M024sc04 Outside sensor T4 closed
M024sc05 Common flow sensor T10 open
M024sc06 Common flow sensor T10 closed
M024sc08 Bus communication: Possibly no bus communication cable connected
Mx24sc09 Temperature increase (Gradient) not fast enough after burner start
Mx24sc10 DT between T1 and T2 > 35°C when gas valve opened
= B
= E
= M
0 = boiler
1 = burner A
2 = burner B
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