Troubleshooting - Bosch TSS Series Installation And Maintenance Instructions Manual

Troubleshooting

13 Troubleshooting
Cause Remedy
Fault: no or insufficient hot potable water.
Immersion heater ▶ Check cables to make sure they are
(accessory) not correctly connected.
working.
▶ Check that the thermostat has been
inserted far enough (contacts must not be
bent).
▶ Check whether the high limit safety cut-out
on the thermostat has been triggered.
▶ Check whether the set temperature at the
thermostat is high enough (see scale).
▶ Measure the resistance of the heating
element. If it has short-circuited, replace
heating element.
Insufficient solar yield ▶ Check whether the capacity of the system is
since the DHW was last sufficient to meet the DHW demand.
drawn off. Integrate a backup system to cope with the
demand.
Excessive heat losses ▶ Pipework too long. Position the system so
at the pipework. that the pipework/cables are as short as
possible.
▶ Install sufficient installation on the DHW
line to the consumer.
Pipework swapped ▶ Check pipework.
round.
Collectors are still ▶ Remedy insufficient ventilation: clean vents
misty after 4 hours on the collector connections, e.g. with a
despite intensive solar thin nail.
radiation.
Solar hose buckled or ▶ Install solar hoses between collector and
installed incorrectly. cylinder with an incline towards the
cylinder and with a sufficiently large radius.
Incorrect orientation ▶ Align collectors so they are facing the
of collector. midday sun.
Heavy soiling of ▶ Clean collector panels with water when the
collector panel. sun is not shining. Never use acetone or
glass cleaner.
Collectors are in the ▶ Remove shading of collectors.
shade.
Fault: potable water too hot - risk of scalding.
Solar yields are too ▶ To avoid scalding, install mixing device and
great which means set limit at 60 °C.
that temperatures
higher than 60 °C are
reached.
Fault: heat transfer medium discharged frequently from the pressure
relief valve.
Maximum temperature ▶ Take system out of operation during long
band reached. periods of absence.
▶ Deactivate the immersion heater
(accessory) outside the heating period and
during summer.
28
Cause Remedy
Fault: loss of potable water or heat transfer medium
Leaks at the collector ▶ Hose clip mounted incorrectly Hose clip not
connection. pushed over the bead of the collector
connection.
▶ Hose clip not secured. Tighten circlip if
hose clip is sitting correctly.
Discharge of potable Discharge of potable water at the pressure
water from the relief valve due to different densities is normal.
pressure relief valve.
▶ Install an on-site expansion vessel on the
cold water connection.
▶ Systematically remove water leaks.
Leaks from using non- ▶ Use temperature-resistant thread sealing
approved thread compound.
sealing compound.
Leaks at the cylinder ▶ Check whether seals have been installed.
connections.
▶ Check whether seals are damaged. Only
screw on connector pipes hand tight then
turn again through ½ revolution
(corresponds to roughly 35 Nm).
Frost damage in the ▶ Replace heat transfer medium if pH value is
solar circuit. ≤ 7 (brown colour, strong odour).
Frost damage in ▶ Protect potable water pipe from frost
potable water circuit.
Table 18 Troubleshooting
TSS – 6720887693 (2018/10)