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74 | Faults
17.2
Faults that are shown on the display
Display
Description
A7
DHW temperature sensor defective.
A8
Communication fault.
Ad
DHW tank temperature not detected.
The DHW tank temperature sensor was recognized
before the connection was lost.
b1
Code plug not detected.
b2/
Internal data error.
b3/
b4/
b5/
b6
b7
Fault in the burner controls.
C6
Fan not running.
CC
Outdoor temperature sensor not recognized.
d3
Temperature high limit defective.
External guard has tripped.
Temperature limiter locked out.
d5
External supply temperature sensor defective
(low-loss header).
The external supply temperature sensor was
recognized on the BUS and then reconnected to
the appropriate terminal.
E2
Supply temperature sensor defective.
E3
Additional supply temperature sensor defective.
E9
Heat exchanger safety high limit or flue gas
temperature limiter has tripped.
Table 29 Faults shown on the display
6 720 810 590 (2015/05)
Elimination
▶ Check temperature sensor and leads for interruptions or shorts, and replace if
defective.
▶ Insert code plug correctly; replace if defective.
▶ Check BUS communications wiring, replace if defective.
▶ Check control, replace if defective.
▶ Check DHW tank temperature sensor and connecting lead, replace if defective.
▶ Reset the boiler to the factory default settings ( service function 8.E), reset
the IPM 2 (if installed) to the factory default settings and carry out the automatic
system configuration.
▶ Insert code plug correctly; replace if defective.
▶ Reset boiler to factory default setting ( service function 8.E).
▶ Reset boiler to factory to default setting ( service function 8.E).
▶ Check fan leads and fan, replace if defective.
▶ Check outdoor temperature sensor and leads for interruptions, replace if
defective.
▶ Verify the outdoor temperature sensor is connected to 3 (Out Sen) on the
terminal block in the low voltage junction box.
▶ Check temperature sensor and leads for interruptions or shorts, and replace if
defective.
▶ Temperature guard TB1 has tripped. Check if jumper across 8-9 or PR-P0 is
missing.
▶ Reset external temperature limiter (if installed).Reset LWCO (if installed).
▶ Check temperature sensor and leads for interruptions or shorts, and replace if
defective.
▶ Check whether only one temperature sensor is connected; otherwise remove
second temperature sensor.
▶ Reset the boiler to the factory default settings ( service function 8.E), reset
the IPM 2 (if installed) to the factory default settings and carry out the automatic
system configuration.
▶ Check temperature sensor and leads for interruptions or shorts, and replace if
defective.
▶ Check temperature sensor and leads for interruptions or shorts, and replace if
defective.
▶ Check flue gas safety high limit and leads for interruptions or shorts, and replace
if defective.
▶ Check heat exchanger safety high limit and leads for interruptions or shorts, and
replace if defective.
▶ Check the operating pressure.
▶ Check temperature limit; replace if defective.
▶ Check pump capacitor; replace pump if defective.
▶ Check PCB fuse, replace if blown (6.3 A fuse according to IEC default).
▶ Purge the appliance
▶ Check heat exchanger on the DHW side; replace if clogged.
Greenstar FS
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