User manual - 1.2
English
37
7.3
Failure table
The letter indications comply with the main figure in §
2.1. An overview of the replacement parts has been
included in § 8.2.
General
Problem
Possible cause
Correction
Err 3 Syst.temp. too low
There is a risk of freezing.
The temperature of the system fluid is
< 0 °C.
Provide a temperature of > 0 °C.
Err 4 Syst.temp. too high
There is a risk of boiling.
The temperature of the system fluid is
> 90 °C.
Provide a temperature of < 90 °C.
Err 5 Entrance flow
The flow in the inlet line has been
blocked
1)
.
The solenoid valve (N) in the inlet line
does not open.
Replace (a part of) the solenoid valve.
A valve in the inlet line is closed.
Open the valve.
The inlet line has been blocked.
Remove the blocking.
The pressure switch (R) is defect.
Replace the pressure switch.
Critical setting adjustment valve inlet
(J).
Turn adjustment valve ¼ position up
(from fully open).
Cable to pressure switch (R)
disconnected or interupted.
Replace the cable. Replace the cable
lugs.
The adjustment valve (P) inlet has not
been set correctly.
Turn the adjustment valve outlet to
the correct position (see § 5.4.1 ).
Err 6 Flow
The flow in the outlet line has been
blocked
1)
.
One of the solenoid valves (N) is not
closing.
Clean valve internally. If necessary,
replace (a part of) the solenoid valve.
The valve in the outlet line is closed.
Open the valve.
The outlet line has been blocked.
Remove the blocking.
The pump (O) does not run.
Check the pump. Check and replace
the pump fuse in the control unit.
The pressure switch (R) is defect.
Replace the pressure switch.
The automatic air vent (B) is blocked.
Replace the automatic air vent.
Err 7 Fluid lack vessel
There is a risk of running dry, the fluid
level in the vessel is at the minimum.
The automatic air vent (B) is defect or
blocked.
Replace the automatic air vent.
The vessel has not been filled.
Fill the vessel (see § 5.5.4).
The level switch (I) is defect.
Replace the level switch.
Cable to level pin disconnected or
interrupted.
Check cable connection.
Replace the cable.
OBJ_BUCH-45-001.book Page 37 Tuesday, June 14, 2011 10:56 AM
