Bosch WR430-3K Installation Operation & Maintenance page 19

6. Parts in water flow valve are corroded so that the
gas passage is not fully opening.
Contact your service person or call:
Canada 1-800-663-8405, U.S.A. 1-800-824-7337.
HOT WATE R TE MPE RATU R E
F LUCTUATE S
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.
See fig 7(a) on
page 12
3
1. Heat exchanger
2. Pilot assembly
3. Burner manifold gas
pressure test nipple
4. Main gas burner
5. Pilot gas tubing
6. Gas valve
7. Electronic control box
8. Power cord
9. on/off switch
10. Temperature
adjustment selector
11. Microswitch
12. Gas inlet gas pressure
test nipple
13. Electric box
14. Exhaust Fan
Fig. 17 - Diagram of WR430-3K
2
5
6
13
7
8
11
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 14 for correct specifications.
See table 1 on
page 14
12
14
1
4
9
10
19