Valeo Thermo H, Installation And Operating Instructions Manual

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Thermo H Malfunctions
74
15 Malfunctions
15.1. Diesel burner head
During all active operating phases of the heater, all electric components,
the operating voltage and functional irregularities are monitored and
recorded. The only exception is the condition component test, in which
the components are not monitored for errors.
If there are any faults, proceed as follows:
Switch off the heater and then switch it on again. If the heater doesn‘t
start, check the following:
– Is the fuel supply ok?
– Is a sufficient amount of fuel in the tank?
– Are the fuses ok?
– Are the electrical connections and cables in order?
– Are the combustion- and exhaust air ways free of obstructions?
A malfunction causes the heater to terminate its operation by a fault
shut-off and to go into the fault lock-out mode to prevent the heater from
an automatic combustion restart. At the same time the operation indica-
tor begins to flash with a specific code (see 13.1).
The fault lock-out occurs:
– low voltage during a defined period
– if combustion was not established during start-up
– if the flame extinguishes during operation
– extrinsic light
– if the control device itself has failed or peripheral components are
defective
Variants to reset the heater after a fault lock-out:
– Switch off the heater and then turn it on again
– Reset the control device, e.g. through disconnecting it from the pow-
er supply
– „Off“ and „On” switching“ via the S-Bus diagnostic interface
– Erase the data in the fault memory by means of the diagnostic tool.
Additional to the fault lock-out a heater lock-out occurs if safety related
components are affected. The fault code 12 will be displayed (see
15.2.).
The heater lock-out occurs:
– overheat protection is triggered, interrupted or defective
– water temperature sensor is defective
– solenoid valve is defective
– flame guard is defective
– repeated malfunctions
– repeated flame interruptions
– flame in purge cycle
– control unit malfunction or programing error
If a heater lock-out has occurred, the heater must be maintained and
released by Valeo-trained personnel.
15.2. Flash code
The kind of malfunction is indicated from the operating indication light
through a flash code or if the timer is used in the display (operation dis-
play). The flash code is immediately generated after detection of the
malfunction and will be kept until the heater is freed.
The flash code comprises of a burst (sequence) of 5 short flashes depic-
ting the break and a defined number of long pulses corresponding to the
malfunction number, which are to be counted. After that the cycle starts
with 5 short flashes again and so on.