Installation Manual

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Troubleshooting
6.8 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. 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.
4. Inspect the water path outside of the heater for
obstructions. Make sure all 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 5.2).
5. Recalibrate thermostat for hotter outlet temperatures.
(See chapter 4.4).
6. The water valve may be dirty, preventing it from fully
opening the gas valve. This part needs to be periodically
serviced (every 2-5 yrs depending on water quality and
use) (see chapter 5.2).
7. Gas pressure is too low. Ensure gas pressure is in
accordance with manufacturer's specifications (see
chapter 3.8). A gas pressure reading is needed to
proceed further. Contact your original installer or a local
certified gas technician to obtain this reading.
6.9 Burners ignite without hot water
flow
1.The water valve may be dirty and sticking, preventing
it from fully closing the gas valve. The water valve needs
to be periodically serviced (every 2-5 yrs depending on
water quality and use) (see chapter 5.2).
6.10 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 gallon jug under a hot outlet to
catch water. Open cold supply to the water heater and
measure flow rate out of the unit. The flow rate should
be close to 3.7gpm, filling the jug in less than16
seconds. If the flow rate is not adequate, inspect and
clean the inlet filter screen (see chapter 5.2).
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 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 and
pressure at all outlets.
5. If the water has a high mineral content, the heat
exchanger may be scaled internally. This restricts the
water path, causing diminished water flow. See
chapter 5.6.1 for descaling instructions.
6.11 Noise when heater is running
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 gallon jug under a hot outlet to
catch water. Open cold supply to the water heater and
measure flow rate out of the unit. The flow rate should
be close to 3.7gpm, filling the jug in less than16
seconds. If the flow rate is not adequate, inspect and
clean the inlet filter screen (see chapter 5.2).
2. Inspect the water path outside of the heater for
obstructions. Make sure all showerheads, faucet
aerators and whole house filters are clear of debris.
Restrictions in the water path can slow water flow
through the heat exchanger causing it to boil and make
noise.
3. Recalibrate the thermostat for cooler temperatures
(see chapter 4.4). If the water temperature remains
excessively hot when the thermostat is adjusted, then it
should be replaced.
4. 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 resulting in noise
and overheating See chapter 5.6.1 for descaling
instructions.
6.12 Burners do not operate cleanly;
yellow flames when operating
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. Gas pressure may be inadequate resulting in
improper combustion. Ensure gas pressure is in
accordance with manufacturer's specifications (see
chapter 3.8). A gas pressure reading is needed to
proceed further. Contact your original installer or a
licensed gas technician to obtain this reading.
3. For proper combustion at high elevations the inlet
gas pressure should be set at installation to the value
shown in chapter 3.7 Table 3 (while operating at
maximum BTU). A gas pressure reading is needed to
proceed further. Contact your original installer or a
licensed gas technician to obtain this reading.
4. Ventilation is not adequate. Ensure adequate
combustion air is being supplied to the unit in
accordance with manufacturer's specifications (see
chapter 3.5).