Thermo E 200 / 320 4 Heater functions
405
4.4.4 Malfunction interlock release and error
clearance
The malfunction interlock is released when the heater is
switched off.
After that it will be immediately ready for operation.
4.5 Heater interlock
The heater interlock overrides the standard malfunc-
tion interlock.
If the heater interlock 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 Spheros in order to
identify the root cause.
After that the heater interlock can be released (see 4.6.1).
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 heater interlock 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 inter-
lock.
Heater interlock 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 unit error or programming error
• Repeated malfunctions (8)
• Repeated flame interruptions (5)
4.5.1 Heater interlock release
Temperature sensor, overheating protection errors or
errors causing overheating cause a heater interlock
in software and hardware.
CAUTION
The heater interlock release is permitted by Spheros
trained personnel only.
The interlock must be released also in software and hard-
ware.
For this purpose the heater must be disconnected from
the vehicle electrical system twice.
The heater interlock release is performed using the
following sequence:
1. Correct the cause of the heater interlock.
2. Switch interlocked heater on.
3. Disconnect the switched on heater for > 10 seconds
from the vehicle electrical system.
4. Reconnect the switched on heater to the vehicle
electrical system.
5. Within 120 seconds disconnect the switched on
heater again from the vehicle electrical system.
6. Reconnect the switched on heater to the vehicle
electrical system again.
NOTE
The heater automatically starts after connecting it to
the vehicle electrical system.
The heater can be switched off in the initial cycle.
4.5.1.1 Release of a heater interlock triggered by
other malfunctions
1. Correct the cause of the heater interlock.
2. Switch interlocked heater on.
3. Disconnect the switched on heater for > 10 seconds
from the vehicle electrical system.
4. Reconnect the switched on heater to the vehicle
electrical system.
5. Within 120 seconds disconnect the switched on
heater again from the vehicle electrical system.
6. Reconnect the switched on heater to the vehicle
electrical system again.
NOTE
The heater automatically starts after connecting it to
the vehicle electrical system.
The heater can be switched off in the initial cycle.
4.6 Error output
If the heater is equipped with the standard timer, an error
output is displayed on the digital timer after a malfunction
occurs, otherwise via flash code at the operating display.
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