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Water Is Too Hot; Water Is Not Hot Enough; Burners Ignite Without Hot Water Flow; 7.10 Low Hot Water Pressure - Bosch 330-PN-N Installation Manual

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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.
330 PN
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.
Troubleshooting | 27
6 720 644 951 (2014/11)

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