27 | P a g e
112 Description: Return sensor defective
Cause: The return sensor T2 value out of range.
1. Check full T2 wiring harness and connectors for signs of damage, corrosion, or loose contact.
2. Use a multimeter to check T2 sensor resistances are in line with the return temperatures.
• The return temperature can be identified using the customer information menu.
• The resistances can be taken at the connector at the PCB (located on the bottom left of the
PCB next to resistor RL5, 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.
Note thermistors may need cleaned and not always replaced.
3. If error 112 remains after the above has been checked, replace PCB.
114 Description: Outside sensor absent
Cause: Outside sensor not present, short-circuited, broken or values outside specifications.
1. If using ATAG One Zone with internet weather:
• Check Wi-Fi signal & re-connect if required.
• If Wi-Fi has failed, change thermoregulation to 2, via parameter 4.2.1. When the WI-FI is re-
established, parameter 2.4.1 can be changed back to 4.
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 114 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. Check parameter 4.2.1 is set to the desired thermoregulation value. Adjust as required and restart boiler by
turning off electricity supply for 5 seconds and then back on again.
5. If code 114 still appears:
a. Carry out factory reset of the PCB in parameter 2.8 *Important* The boilers parameters will need
reset. If LPG, then the Eprom chip will need to be used to set up the boiler again.
b. If error 114 remains after confirming the outdoor sensor and cables are ok, and/or carrying out the
factory reset, replace the PCB.
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