Checking The Supply/Return/Safety Sensors Cable; Checking The Hot Surface Ignitor; Control - Buderus Logamax plus GB142-24 Servicing Instructions

8 Actions

8.1.10 Checking the supply/return/safety sensors cable

WARNING!
Avoid damage: do not push the measuring pin of
the volt-ohm-multimeter too deeply into the socket.
 Check all plug and socket connections of the sensors and the
UBA 3. A plug that has not been inserted correctly may be the
cause for a fault message. Then start the boiler by pressing
c
"Reset" .
 Switch off the power supply of the heating system on the circuit
breaker.
 Set the main switch on the BC10 to "0" (Off).
 Remove the casing.
 Loosen the fastening screw of the UBA 3 (see fig. 18, pos. 1).
 Remove the UBA 3 by pulling it forward as indicated by the
arrow (see fig. 18, pos. 2).
 Disconnect the plug and socket connection of the cable for the
sensor.
 Check the cable between the plug and socket connection and
the 81-pole plug in the UBA 3 installation base (see fig. 19)
using a circuit continuity testing device.
See the electric circuit diagram, fig. 110 on page 126.
 Test this in a straight line twice and test it diagonally twice.
 Restore the plug and socket connection if the cables are OK.
 Install the UBA 3.
 Fit the casing.
 Switch on the power supply of the heating system on the circuit
breaker.
 Set the main switch on the BC10 to "1" (On).

8.1.11 Checking the hot surface ignitor; control

NOTICE
The hot surface ignitor can be controlled using the
RC control device relay test function. Further
instructions for the RC control device are in the
installation and maintenance instructions.
 Switch off the power supply of the heating system on the circuit
breaker.
 Set the main switch on the BC10 to "0" (Off).
 Remove the casing.
 Disconnect the plug and socket connection of the hot surface
ignitor.
 Set the measuring device to 120V AC.
 Connect the measuring device to the plug on the cable
harness.
 Connect the heating system to the power supply, insert the
main fuse or switch on the circuit breaker.
92 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
2
1
fig. 18 Dismantling the UBA 3
fig. 19 UBA 3 installation base