Bradford White M-2-TW-75T6SX - Manual (Page 40)

40
TROUBLESHOOTING
One short flash every
four seconds
Alternates bright and
dim (Heartbeat) Thermostat calling
for heat (no fault).
Short flash once every
second Weak pilot signal on
last call for heat.
Two flashes, three
second pause
Pressure switch not
working-closed
position.
Three flashes, three
second pause
Pressure switch or
blower temperature
switch not working -
open position.
Four flashes, three
second pause
Excessive tank
temperature.
System must be reset.
Five flashes, three
second pause False pilot flame
present.
Six flashes-one flash,
three second pause
(Soft lockout) Failed to light pilot.
System auto resets
after 5 minutes.
Six flashes-two flashes,
three second pause
(Soft lockout)
Pressure switch or
blower temperature
switch opened during
burner operation.
System auto resets
after 5 minutes.
LED Status
Stand-by mode,
Thermostat is satisfied
(no faults).
Control Status Probable Cause
Temperature demand is satisfied (no call for heat).
Tank temperature below set point of thermostat.
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. Pressure switch tubing kinked or blocked.
2. Blocked pressure tap on switch.
3. Faulty pressure switch.
1. Vent blockage or improper vent configuration.
2. Pressure switch tubing kinked or blocked.
3. Blower not spinning up to speed.
4. Vent temperature too high
5. Faulty pressure switch or vent limit switch.
1. Thermowell sensor out of calibration.
2. Faulty gas valve.
1. Pilot valve stuck in open position.
1. Unstable pilot.
2. Pilot tube blocked or restricted.
3. Oxidation build up on pilot electrode.
4. Wire damage to pilot assembly or bad connection
at gas valve.
1. Pressure switch tubing kinked or blocked.
2. Vent blockage or improper vent configuration.
3. Vent termination being affected by windy
conditions.
4. Blower not spinning up to speed.
5. Vent temperature too high
6. Faulty pressure switch or blower temp. switch.
None (LED not on or
flashing) Electrical power not
present. Control power switch in “OFF” position.
Supply voltage interuppted.