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During all active operating phases of the heater, all components, the operating voltage
and functional irregularities are monitored and recorded.
Sole exception is the component test status in which the components are not monitored
for faults.
A malfunction causes the heater to terminate its operation by a fault shutoff and to go
into the fault lock-out mode to prevent the heater from an automatic combustion
restart. At the same time the operation indication begins to flash with a specific code.
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
if the counter threshold is reached because of a repeated reduction of the
lower switching threshold to extend the heating duration (minimum
combustion time)
Variants to reset the heater after a fault lock-out:
1. Switch off the heater and then turning it on again.
2. „Off“ and „On” switching“ via the W-Bus S diagnostic interface
3. Reset the control device, e.g. through disconnecting it from the power supply.
4. 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 heater lock-out occurs:
overheat protection has been activated, is disconnected or defective
water temperature sensor is defective
solenoid valve is defective
flame guard is defective
repeated malfunctions
repeated flame interruptions
flame within the purge cycle
control device malfunction or program error
Malfunction
Flash code
The kind of malfunction is indicated from the operating indication light through a flash
code or if the standard timer is used in the display (operation display). 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 depicting 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.
The meaning of the number of long pulses is shown in the table below.
Table: Flash codes
No. of
Long Description of malfunction
pulses
0 Control Device malfunction (faulty checksum or no EOL programming)
1 No start within the safety time
2 Flame interruption, restart failed
3 Low voltage
4 Extrinsic light before starting or within the purge cycle
5 Flame guard defective
6 Temperature sensor / overheat protection defective
7 Solenoid valve defective
8 Combustion air fan motor defective
9 Circulating pump defective
10 Overheat protection has been activated
11 Electronic ignition unit defective
12 Heater fault lock-out, caused by several malfunctions or flame
interruptions
13 Nozzle pre-heater defective
14 Minimum combustion time was not reached several times
15 Revolution signal faulty
Subject to modification
Thermo S
160/230/300/350/400
If a heater lock-out has occurred, the heater must be maintained and released by
Spheros trained personnel.
Operating and
service instructions
7


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