Fault Finding Solutions Sections - Baxi Bermuda BBU 15 HE Installation & Servicing Instructions Manual

Fault Finding Solutions Sections

A
Is there 230V at:
1.
Main terminals L and N
2. Main terminal fuse
3.
PCB - X1 connector
terminals 1,2
B
Check all system wiring and pump
C
Service Reset
Condensate Pump does not run
PCB - X3 connector terminals 5 &
1.
6 for at least 2 seconds
Condensate Pump terminals for at
2.
least 2 seconds
Condensate Pump runs
D
Fan connections correct at fan. PCB -
X2 connector, is 230V AC across
terminals 5 & 7
E
E20 - Temperature sensor faulty.
Cold resistance approximately
10kΩ @ 25° C
(resistance reduces with increase in temp.)
E28 - Incorrect PCB fitted
F
1.
Check and correct the connection of the
tube between the venturi and gas valve
2. Gas at burner
G
Check and correct if necessary
1. Ignition electrode and lead
2. Electrode connection
3. Spark gap and position
36
© Baxi Heating UK Ltd 2010
Supplied By www.heating spares.co Tel. 0161 620 6677
NO
NO
NO
On Reset is there 230V at:
NO
NO
YES
YES
YES
NO
NO
NO
Ensure gas is on and purged
PCB - X3 connector is 230V AC across
terminals 1 & 2
voltage at PCB - X2 connector is
110V AC across terminals 2 & 5
YES
(Note: from multimeter connect
'common' to 2 & 'volts' to 5)
Check wiring
12.0 Fault Finding
Check electrical supply
Replace fuse
Check wiring
Replace PCB
Replace wiring
Replace Cond. Pump
Condensate drain system blocked
NO
Replace Float Switch
Fan jammed or faulty winding
Replace PCB
Replace sensor or PCB (E28)
Replace PCB
NO
YES
Replace gas valve
NO
YES
NO
Display
Replace PCB
illuminated
YES
Clean condensate drain system
YES
Replace fan
Replace PCB
Replace igniter