3 | P a g e
10 Description: Outside sensor error
Cause: Outside sensor not present, short-circuited, broken or values outside specifications.
1. If using ATAG One with internet weather:
• Check Wi-Fi signal & re-connect if required.
2. If internet weather is not being used, check if outdoor sensor is in use with boiler.
3. If an outside sensor is fitted and code 10 appears on the boiler, check the following:
• Check the resistance of the outdoor sensor as per the table on page 67 and replace as
required.
• Check whether the cables for the outdoor sensor are connected to the boiler.
• Check that the cable is not damaged, broken or has any poor contacts. Use a multimeter to
confirm continuity of the cables. Replace harness as required.
• Check whether the outdoor sensor is mounted in such a way that it is not affected by
weather influences (sunlight, snow, etc.).
4. If error 10 remains after confirming the outdoor sensor and cables are ok, replace the PCB.
20 Description: Flow sensor error
Cause: The flow sensor T1 value out of range.
1. Check full T1 wiring harness and connectors for signs of damage, corrosion, or loose contact.
2. Use a multimeter to check if T1 sensor resistances are in line with the flow temperatures.
• The flow temperature can be identified using the A menu and A0.
• The resistances can be taken at the connector at the PCB X4 pins 1 & 2. This checks the
wiring harness continuity at same time. Disconnect the connector from PCB 1
st
to ensure no
additional resistances are given through the PCB. Resistances are found on page 67.
• If the readings are incorrect, disconnect the wiring harness from the sensor and check the
sensor readings without the harness to prove if the sensor or harness is the fault. Replace
part as required.
*Note thermistors may need cleaned and not always replaced*.
3. If error 20 remains after the above has been checked, replace PCB.
28 Description: Flue gas sensor fault
Cause: Flue gas sensor not fitted to our boilers so if 28 fault code appears replace PCB.
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