Actions; Testing, Measuring, Adjusting And Replacing Various Components; Checking The Uba 3 Fuse; Replace If Necessary - Buderus Logamax plus GB142-24 Servicing Instructions

8

Actions

8 Actions
8.1 Testing, measuring, adjusting and replacing
various components
8.1.1

Checking the UBA 3 fuse; replace if necessary

 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 by turning it counter-
clockwise (see fig. 4, pos. 1).
WARNING!
Do not pull or move side to side the UBA 3
during loosening or tightening of UBA 3 fastening
screw.
 Remove the UBA 3 once the fastening screw is fully loosened
by pulling it forward carefully as indicated by the arrow (see
fig. 4, pos. 2).
 Dismantle the fuse holder by loosening the bayonet connector
(see fig. 5, pos. 1).
 Remove the fuse from the fuse holder.
 Check the circuit continuity through the fuse using the volt-ohm-
multimeter. If broken, replace it by (a new) spare ceramic fuse
5 amps, 250V fast blow (F5AH, 250V) (fig. 5, pos. 2).
 Re-assemble the UBA 3 in reverse order of disassembly.
 Fasten the UBA 3 by only turning the fastening screw clock-
wise.
WARNING!
Do not push or force the UBA 3 in place by hand.
 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).
84 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
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fig. 4 Dismantling the UBA 3
1
fig. 5 Checking the fuses
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