Valeo Thermo E+ 120 - Fault Lock-Out

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Thermo E+ 120/200/320 4 Heater functions
4.4 Fault lock-out and heater lock-out
A distinction is made between fault lock-out and heater
lock-out.
The lock-outs protect the heater and the surrounding
vehicle assemblies against sequence errors after a failure
or a malfunction of individual heater components.
In a heater lock-out safety-related components are
affected by the failure or malfunction. It may only be
released by Valeo trained personnel after eliminating the
cause.
Each fault lock-out and heater lock-out is stored in the
control device.
4.4.1 Fault lock-out
If one of the malfunctions listed below occurs, the heater
will initiate a fault shut-down, followed by a fault lock-out.
Depending on the error timing, no purge cycle or a 120
seconds purge cycle will be executed.
Flash impulses are outputted via the operation indicator.
In case of several sequential fault lock-outs a heater lock-
out is initiated (see 4.4.2).
4.4.1.1 Malfunctions during switching-on and start
procedure
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 fault lock-out.The motor stops immedia-
tely or does not start.
Malfunction causes:
• Short circuit and/or interruption of electrical
components:
– burner motor (stops immediately)
– Electronic ignition unit
– Optional nozzle block preheater
• Interruption of circulating pump operation
• Flame or extraneous light detection by the flame
detector prior to ignition of the high-voltage ignition
spark.
• No start: No flame detection within 15 seconds after
opening the solenoid valve.
• Temperature sensor delivers unacceptable tempera-
ture values.
• Heater operation outside the permissible temperature
range.
• Voltage falls short of the low voltage threshold of
approx. 20.5 (10*) Volt at motor start or within a dura-
tion of 20 seconds after a heating request.
• Voltage exceeding the high voltage threshold of
approx. 30 (15*) Volt at motor start or within a duration
of 6 seconds (purge cycle only, no fault lock-out).
• Plug of the electronic ignition unit is inserted wrong
• Control device malfunction
4.4.1.2 Malfunctions during heater operation
NOTE:
In case of malfunctions during heater operation, first a 120
seconds purge cycle will be performed. Then the heater is
switched into the fault lock-out.
Malfunction causes:
• Short circuit of the circulating pump.
• Short circuit or interruption of other electrical compo-
nents (motor, solenoid valve, electronic ignition unit,
nozzle block preheater).
• Water temperature greater than the upper switching
threshold.
• Temperature sensor delivers unacceptable tempera-
ture values.
• Heater operation outside the permissible temperature
range.
• Flame interruption (combustion interruption for longer
than 15 seconds).
• Voltage falls short of the low voltage threshold of
approx. 20.5 (10*) Volt at motor start or within a dura-
tion of 20 seconds after a heating request.
• Voltage exceeding the high voltage threshold of
approx. 30 (15*) Volt at motor start or within a duration
of 6 seconds (purge cycle only, no fault lock-out).
• Control device malfunction.
4.4.1.3 Malfunctions during purge cycle
Malfunction causes:
• Short circuit or interruption of the burner motor (stops
immediately)
• Interruption of circulating pump operation
• Heater operation outside the permissible temperature
range.
• Voltage falling short of the low voltage threshold of
approx. 20.5 (10*) V at motor start or within a duration
of 20 seconds after a heating request.
• Voltage exceeding the high voltage threshold of
approx. 30 (15*) V at motor start or within a duration
of 6 seconds (purge cycle is applied, but no fault lock-
out).
• Control device malfunction.
* at 12V rated voltage