Installation / Operation Instruction Manual

59
Troubleshooting
RTG-K-199/160N/X1 – 6 720 817 984 (2022/06)
8.6 Hot water temperature fluctuates at faucet
1. If the water heater set point temperature is high, mixing at
the faucet could deactivate the water heater. The addition
of too much cold will overpower hot water flow from the
tankless water heater reducing its flow below the activation
point.
If this slows the flow through the tankless water heater
below its deactivation point, it will shut off the burner. The
end result is nothing but cold water coming out of the
outlet. Consult www.bradfordwhite.com for support.
2. Unbalanced pressure in water lines. Any restriction in the
water heater, such as a clogged inlet filter screen, can result
in unequal pressures between the cold and hot water lines.
In such cases, when mixing in the higher pressure cold
water at the tap, the lower pressure hot water can be
overpowered. This will shut down the burners because the
hot water flow rate fell below the minimum flow rate
required for activation. Verify inlet filter screen is clean and
clear of debris. See chapter 7.1, page 55 for inlet filter
cleaning instructions.
3. The water heater deactivated by temperature balancing
valves. If the outlet water temperature is set too high, the
heater can produce temperatures that are too hot. A
temperature balance shower valve will automatically mix in
cold water to reduce the hot water temperature. In the
event of any temperature instability at a fixture using a
temperature balancing valve, refer to the valve
manufacturer for instructions on internal adjustment
setting. An adjustment should be made to minimize the
amount of cold water the valve is adding. Additionally, the
temperature setting on the heater can be lowered to reduce
the amount of cold water that the temperature balance
mixes in.
4. Inlet water pressure is erratic due to fluctuating supply
water pressure. For installation on a private well system
with the use of a pressure tank, the lowest pressure range
setting recommended is 30 - 45 psi (2.06 - 3.1 bar).
Consult your installer or local plumber for effective ways to
maintain constant water pressure to the appliance when on
a well system.
8.7 Noisy burner/heater during operation
Burner noises can be heard if combustion is not properly set.
This could be caused by improper gas supply conditions (gas
pressure and/or gas composition).
Two types of noise can be heard: low pitch noise/vibration
(rumbling) and high pitch noise/vibration (whistling).
8.7.1 High pitch noise
1. Verify if correct gas type is selected (see section 3.3).
2. Verify if gas pressure is within specified range (see
section 3.2).
If gas type is properly selected, gas pressure is within range
and the problem persists:
3. Perform the gas and air adjustment as described in
section 8.11.
8.7.2 Low pitch noise
1. Verify if correct gas type is selected (see section 3.3).
2. Verify if gas pressure is within specified range (see
section 3.2).
If gas type is properly selected, gas pressure is within range
and the problem persists:
3. Perform the gas and air adjustment as described in
section 8.11.
8.8 Error codes C1, C2, CF and/or CE
C1, C2, CF and CE errors could be caused by a too long flue
and/or an obstruction in the venting.
1. Verify if there are any venting obstructions and remove
them if that is the case.
2. Clean or replace the air filter, see chapter 7.1, page 55.
3. Ensure that the venting used is according to specifications
(see section 4.6).
4. Reset the error by holding the On/Off button for 3s.
If there are no obstructions, and the problem persists:
5. Perform the gas and air adjustment as described in
section 8.11.
6. If it is not possible to solve the problem with these
measures and error persists, the burner surface (ceramat)
might be obstructed (e.g. clogging due to dust/particles in
the air). Contact Bradford White support line for further
assistance into the diagnosis if your installation fits this
description; in case of confirmation, replace the burner and
revise installation conditions ( section 4.3) to avoid
reoccurrence.
8.9 Error codes EA and/or EC
EA and EC errors can appear if combustion is not properly set.
This could be caused by improper gas supply conditions (gas
pressure and/or gas composition).
1. Verify if correct gas type is selected (see section 6.7.1).
2. Verify if gas pressure is within specified range (see
section 3.2).
If gas type is properly selected, gas pressure is within range
and the problem persists:
3. Perform the gas and air adjustment as described in
section 8.11.