Bosch GWH 425 PN Specifications download pdf (Page 19)

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Troubleshooting

B 4. Check the inlet water pressure. For installation on

a private well system with the use of a pressure tank,

the lowest pressure range setting recommended is

30-50 psi (2.07 - 3.45 bar). Confirm that the

pressure tank is not water logged.

B 5. Service water valve See chapter 5.1 for intervals

and instructions.

B 6. ECO (overheat sensor) tripped due to overheating

re-ignite the appliance 10 minutes later. If it happens

again, contact your service person.

6.5 Water is too hot

B 1. Check gas type on right side panel rating plate.

NG is a natural gas unit and LP is for liquid propane.

B 2. Since the unit does not measure incoming water

temperature, the output water may be warmer in the

summer than in the winter. Use the slide control to

lower output temperature as outlined in chapter 4.4.

B 3. Contact you service person if water temperature

does not lower per procedure outlined in

chapter 4.4.

6.6 Water is not hot enough

B 1. Adjust the temperature per chapter 4.4.

B 2. Shut off installer supplied cold water supply valve

(if none installed, install before proceeding). Open all

hot water taps supplied by the 425 HNO. Wait 5

minutes and check all taps. Water running is a sign

of a plumbing cross-over. Consult a local plumber or

service person for help in correcting plumbing cross-

over.

B 3. While the heater is running with full hot water flow,

the flames should be 3-4" tall off the burner bed. If

the flames are not this tall, have the gas pressure

measured per chapter 3.6 by a licensed gas

technician or your service person.

B 4. Service water valve See chapter 5.1 for intervals

and instructions.

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Bosch GWH 425 PN Specifications Page 19