A.O. Smith 140 Benutzerhandbuch

Installation and Service Manual Upsilon-Series

Block.
B000sc00

Error
E000sc00

Message
M000sc00

Error report

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

= B

Main code Error

= E

Main code Message

= M

Followed by a character

0 = boiler

1 = burner A

2 = burner B

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

* When this code is shown with an M instead of a B or E then a reset with the reset button is possible.

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