Bosch 125B LP Specifications download pdf (Page 27)

6 720 644 951 (2014/11)330 PN

Troubleshooting | 27

of a temperature balance shower valve, refer to shower valve

manufacturer's instructions for internal adjustment setting. An

adjustment should be made to minimize the amount of cold

water the valve is adding.

7. The gas pressure also needs to be stable and adequate.

Ensure gas pressure is in accordance with manufacturer's

specifications (see chapter 4.9). A gas pressure reading is

needed to proceed further. Contact your original installer or a

local certified gas technician to obtain this reading.

8. A water valve, which has not been serviced, may be

struggling to keep the gas valve open. The water valve requires

periodic maintenance (every 2-5 years depending on water

quality and use) (see chapter 6.2).

7.7 Water is too hot

1. Verify gas type indicated in rating sticker located on right-

hand side of cover, coincides with the gas type you are using.

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

2. Adjust the gas control slide button from three flame position

towards the one flame position for cooler temperatures. If the

water is still too hot, the temperature adjustment knob on the

water heater maybe set too high. Lower the setting and test

water temperature. This dial turns counter clockwise for lower

temperatures and clockwise for higher temperatures.

3. Inlet water is preheated. This model does not have a

thermostat and thus will not modulate flame height in order to

prevent over heating. It is designed for a cold water feed only.

Replumb the heater with cold water to the inlet.

4. Increase the flow rate. Restrictions in the water path can

slow the flow of water through the heater, resulting in very hot

outlet temperatures. Restrictive showerheads and faucet

aerators should be cleaned out or upgraded with less

restrictive ones. In addition, the water heater's inlet filter

should be cleaned and inspected (see chapter 6.2).

5. If water is still too hot, consult service bulletins on

www.bosch-climate.us to lower outlet temperatures further.

6. If the water has a high mineral content, the heat exchanger

may be scaled internally. This restricts the water path, causing

the water to boil and produce extremely hot temperatures.

Instructions for descaling the heat exchanger are available at

www.bosch-climate.us.

7.8 Water is not hot enough

1. Verify gas type indicated in rating sticker located on right-

hand side of cover, coincides with the gas type you are using.

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

2. Flow at one particular tap is too great or too many fixtures are

running at one time. Lower flow to stay within heater's

specifications.

3. Ensure the gas control slide button is all the way to the right.

In addition, the temperature adjustment knob on water heater

maybe set too low. Turn the knob clockwise for higher

temperatures and test the water temperature.

4. Shut off installer supplied cold water shut off valve (if none

installed, install before proceeding). Open all hot water taps

supplied by the heater. Wait 5 minutes and check all taps. Any

water running is a sign of a plumbing crossover. Consult a local

plumber or service person for help in correcting a plumbing

crossover.

5. Inspect the water path outside of the heater for

obstructions. Make sure all outlets (i.e. showerheads, faucet

aerators and whole house filters) are clear of debris. Also, the

water heater's inlet filter screen should be inspected and

cleaned (see chapter 6.2)

6. The water valve may be dirty, prohibiting it from fully

opening the gas valve. This part needs to be periodically

serviced (every 2-5 years depending on water quality and use)

(see chapter 6.2).

7. Gas pressure is too low. Ensure gas pressure is in

accordance with manufacturer's specifications (see

chapter 4.9). A gas pressure reading is needed to proceed

further. Contact your original installer or a local certified gas

technician to obtain this reading.

7.9 Burners ignite without hot water flow

1. The water valve may be dirty and sticking, prohibiting it from

fully closing the gas valve. This part needs to be periodically

serviced (every 2-5 years depending on water quality and use)

(see chapter 6.2).

7.10 Low hot water pressure

1. Confirm adequate flow rate through the unit. With cold

supply shut off to the unit, disconnect hot outlet side to the

unit. Place a half gallon jug under hot outlet to catch water.

Open cold supply and measure flow rate out of the unit. With

temperature adjustment knob set all the way clockwise, the

flow rate should be close to 2gpm, filling the jug in 15 seconds.

With the temperature adjustment knob set all the way

counterclockwise, the flow rate should be close to 4gpm, filling

the jug in 7 seconds. If the flow rate is not adequate, inspect

and clean the inlet filter screen (see chapter 6.2).

2. Confirm the incoming water pressure to the unit is above the

required 30psi.

3. Inspect the water path outside of the heater for

obstructions. Make sure all outlets (i.e. showerheads, faucet

aerators and whole house filters) are clear of debris.

4. Be sure to run only one major application at a time with this

unit. Opening too many taps at one time can disperse water

flow resulting in a diminished flow/pressure at all outlets.

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Bosch 125B LP Specifications Page 27

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