405
Thermo E+ 120/200/320
4 Heater functions
4.4.1.4 Fault lock-out release and error clearance
The fault lock-out is released when the heater is switched
off.
After that it will be immediately ready for operation.
The detected error is stored in the error memory and can
be read using DTT diagnosis.
It is possible to delete the stored error using the DTT
diagnosis
4.4.2 Heater lock-out
The heater lock-out overrides the standard fault lock-
out.
If the heater lock-out is active, neither start nor purge
cycle are executed after switching the heater back on.
Prior to restarting the heater troubleshooting must be
performed by personnel trained by Valeo in order to iden-
tify the root cause.
After that the heater interlock can be released (see
).
Here it is differentiated between interlocks caused by
overheating and interlocks caused by other errors.
NOTE:
If malfunctions occur during switching-on or during the
start process prior to ignition, the heater will be switched
off without purge cycle.
The heater is in the heater lock-out state.
The burner motor stops immediately or does not start.
Besides that a purge cycle between 30 seconds and 120
seconds is performed depending on error type and timing.
Subsequently the heater status is switched to heater lock-
out.
Heater lock-out causes:
•
Short circuit and/or interruption of electrical compo-
nents:
– Solenoid valve
– Flame detector
– Overheating protection
– Water temperature sensor
•
Flame not expired within 30 seconds after purge cycle
started (Burner motor stops)
•
Overheating protection triggered
•
Control device error or programming error
•
Repeated malfunctions
•
Repeated flame interruptions
4.4.2.1 Heater lock-out release
To release, the switched on heater must be disconnected
from the vehicle electrical system as follows.
Release a heater lock-out without DTT diagnosis:
NOTE:
Disconnect the power supply for release, by pulling the
plug C is not permissible.
1. Remedy the cause of the heater lock-out.
2. Disconnect the power supply (
Observe
!
) for at
least 10s.
3. Reconnect power supply.
4. Switch the locked-out heater off and then on again.
5. Repeat steps 2. and 3.
6. Heater is ready for service and starts, if necessary
turn it off.
NOTE:
If the main switch remains in the on position when discon-
necting the power supply, the heater automatically starts
after connecting it to the vehicle electrical system.
The heater can be switched off during initial cycle.
Release the heater lock-out using the DTT diagnosis:
1. Connect the heater with the DTT diagnosis and read
out the error memory.
2. Remedy the cause of the heater lock-out.
3. Disconnect the power supply (observe 5.2 !) for at
least 10s.
4. Reconnect the heater to the vehicle electrical system.
5. Using the DTT diagnosis, delete the error/error
memory.
4.5
Error output
If the heater is equipped with the standard timer, an error
output is displayed on the pre-selection timer after a
malfunction occurs, otherwise via flash code at the opera-
tion indicator.
Summary of Contents for Thermo E+ 120
Page 64: ...memos...
