8 Troubleshooting – Possible faults
172
F024
Temp. acc. bot-
tom open circuit
•
Sensor is faulty
•
Open circuit in sensor cable
•
Sensor not connected
•
Connect sensor
•
Replace cable
•
Check terminal (check plug
for secure fit)
•
Exchange the faulty sensor
(plug on the I/O circuit board)
with a different sensor
•
If a different fault appears, the
sensor should be replaced
•
If the same fault appears, the
I/O circuit board should be
replaced
F025
Checking the
lambda
sensor
•
Lambda sensor faulty
•
Open circuit in the line
•
Fuse F4 (on I/O circuit board)
is faulty
•
Check lambda sensor, replace
if necessary
•
Check line and plug
•
Replace fuse
F026
The lambda
Sensor is faulty
•
Lambda sensor is faulty or
heavily soiled
•
Clean lambda sensor, then
recalibrate (parameter
h-38
)
•
Replace sensor if necessary
F027
Check sum error,
parameters reset
to defaults
•
Fault in the control EPROM,
all parameters will be reset to
factory defaults
•
Check all settings and adjust
current values.
F028
Safety circuit
Emergency Stop
•
Emergency Stop activated
•
Unlock emergency stop
•
Acknowledge fault with main
switch off/on
F029
Safety circuit
Low on water
•
Check water pressure
•
Unlock insufficient water
cutout
•
Acknowledge fault with main
switch off/on
•
Check plug on circuit board
22 /23
F032
Cleaning system
limit switch,
top
•
Cleaning function blocked
•
Faulty limit switch
•
Check cleaning system
•
Have limit switch checked by
a qualified electrician
F035
HC module 0
not connected
•
Power supply has failed
•
Bus cable is not connected
•
Bus cable is fitted the wrong
way around
•
Check the power supply
•
Check connection of bus
cable
F036
Software not
compat. with
this hardware
•
Software is not compatible
with this hardware
•
Use a new software
•
Notify HDG customer service
F040
Supply temp. HC1
open circuit
•
Sensor not connected
•
Sensor is faulty
•
Have the fault fixed by a qua-
lified electrician
No.
Fault
Cause
Remedy
Table 8/1 - Faults
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