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Bradford White TW4-75S-76B-3X User Manual

Page 15

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Troubleshooting

Observe green LED indicator on Electronic gas
control. Error flash codes are displayed with a
three second pause before repeating. Check
and repair the system as noted in the
troubleshooting table below.

Green LED

Indicator

Short flash, once every
four seconds

“Heartbeat”, alternates
bright/dim

Thermostat calling
for heat (no fault).

Short flash once per
second

Weak pilot signal
on last call for heat.

Two flash, three second
pause

Pressure switch not
working-closed
position.

Three flash, three second
pause

Pressure switch or
blower temp.
switch not working
-open position.

Four flash, three second
pause

Excessive tank
temperature.
System must be
reset.

Five flash, three second
pause

Undesired-false
pilot flame present.

LED Status

Stand-by mode,
Waiting for call for
heat (no fault).

Control Status

Service

Procedure

Probable Cause

Temperature demand is satisfied

Normal operation.

Adjust thermostat to

temp level

Tank temperature below set point of thermostat.

Normal operation.

Adjust thermostat to

temp level

1. Unstable pilot.
2. Pilot tube block or restricted.
3. Oxidation build up on pilot electrode.
4. Wire damage to pilot assembly or bad

connection at gas valve.

1. Page 15

2-4. Page 17

1. Pressure switch tubing kinked or blocked.
2. Blocked pressure tap on switch or blower.
3. Faulty pressure switch.

Page 18

1. Vent blockage or improper vent configuration.
2. Pressure switch tubing kinked or blocked.
3. Faulty pressure switch.
4. Blower not spinning up to speed.
5. Blower temp or exhaust temp too high
6. Faulty blower temperature switch.

1. Check vent or vent tables.

2 & 3 Page 18

4. Page 20

5 & 6 Page 22

1. Thermal well sensor out of calibration.
2. Faulty gas control.
3. Pluming leak

1. Page 24

2. Replace gas control,

page 24

1. Pilot valve stuck in open position.

Replace gas control,
page 24

None, control LED not on
or flashing

No electrical
power

Control power switch in “OFF” position.
Supply voltage interrupted.

Turn power on

Page 15

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