Bosch Pilot Ignition TF250 Series Installation Manual And Operating Instructions page 21

Problem
Not hot enough
Temperature too hot in summer.
Temperature too cold in winter.
Fluctuation in hot water temperature.
Reduced water flow.
Hot water take a long time to reach hot
taps.
No hot water
Table 12
Pilot Ignition – 6 720 886 398 (2021/02)
Cause
Insufficient gas supply (pressure/pipe
sizing).
Consumer gas and water controls.
LPG gas cylinders may be empty/
undersized.
Incoming water temperature has
increased with the ambient temperature.
Incoming water temperature has
increased with the ambient temperature.
Insufficient flow through the hot water
unit.
Tapware/shower head does not give
sufficient flow or blocked.
Appliance temperature set too high.
Blocked tapware.
Insufficient water supply pressure.
Blocked water filter.
Heat exchanger blocked (limescale).
Location of appliance.
Pilot light off.
Solution
Requires a service technician to inspect
and test gas supply pipes/pressures and
recommission.
Adjust gas and water controls, refer to
temperature adjustment section.
Adjust gas control slide to the left.
Adjust gas control slide to the left.
Change tapware to meet requirements.
Check for blockages of aerators/
restrictors.
Adjust gas control slide to the left.
Check for blockages.
Requires a qualified technician to inspect
supply pressures and water components
of the hot water unit.
The further from a hot tap, the longer it
takes for hot water delivery. Locate
appliance closer to hot tap.
Relight pilot light, refer to relighting
section.
Troubleshooting
21