Fault Messages - Buderus Logano plus GB312 Installation Manual

10.2.2 Fault messages

Type Display
1)
code Fault code Cause
B 2E 207
B 2U 565
V 2U 575
V 3C 537
V 3C 538
V 3C 540
V 4A 520
Tab. 17 Fault messages
1) V = locking; B = inhibiting; BC = operating code
Logano plus GB312 - Technical specifications are subject to change without prior notice
Description
The water pressure is -
< 8.7 psi (0.6 bar).
Difference between Heat exchanger
supply and return tem- cut-out due to
perature too great. excessive tempera-
ture spread.
(>72 °F; >40 K)
Boiler sensor/ISTB The maximum per-
sensor. missible tempera-
ture at the ISTB has
been reached.
No speed signal. The SAFe is not
receiving a speed
signal even though
the fan is supposed
to be running.
Fan speed too slow. The actual speed
detected is slower
than the set speed.
Fan speed too fast. The actual speed
detected is faster
than the set speed.
Boiler safety tempera- The flow tempera-
ture limiter (STB). ture has reached
200 °F/93 °C (cut-
out temperature of
boiler temperature
limiter).
Troubleshooting
Testing
sequence/Cause Action
Is system pressure Adjust operating
at least 14.5 psi (1 pressure.
bar)?
System configura- Check system con-
tion problems. figuration.
Check water flow. Check water flow.
Check non-return
valve direction of
flow.
Check boiler sen-
sor/STB.
Check connecting Establish good
leads between electrical contact.
SAFe and fan for Replace lead if nec-
poor contact, breaks essary.
and damage.
Check connectors If fan has power
on SAFe and fan. (but is not running)
replace fan.
If fan has no power,
replace the SAFe
Dirt in fan. Clean fan if neces-
sary.
Fan defective.
Replace fan.
Check PWM signal/ Establish good
SAFe connecting electrical contact.
lead for poor con- Replace lead if nec-
tact, breaks and essary
damage.
Check connectors Replace fan.
for damage.
Fault can only occur Check system con-
as a result of faults figuration. Check
in system configura- non-return valve is
tion (e.g. only with 2- fitted correct way
boiler systems). round.
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