Bosch WR 400-3.K Série Mode D'emploi page 12

6. Parts in water flow valve are corroded so that the
gas valve is not fully opening.
Contact your service person or call:
Canada 1-800-663-8405, U.S.A 1-800-824-7337.
HOT WATER TEMPERATURE FLUCTUATES
1. Unbalanced pressure in waterlines.
The added restriction caused by the Bosch in the hot water
system can result in uneven pressures between the cold
and the hot. In such cases when mixing cold water at the
tap, the lower hot water pressure may be overpowered by a
much higher cold water pressure, which may cause the
Bosch burners to shut down. Make sure faucet aerators or
shower heads are free of minerals. Do not add any flow
restrictor to the shower head
2. Cold water is mixing with the hot water between
the Bosch and the outlet.
See # 4 under "NO SPARK AT THE PILOT".
3. Inlet water pressure is erratic due to inadequate
supply water pressure or saturated pressure tank on
well system.
Check the inlet water pressure. On a private well, raise
minimum pressure setting to 40 psi. Confirm that the
pressure tank is not water logged.
4. Gas pressure is too low.
See page 8 for correct specifications.
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