Service Manual

Troubleshooting
PV Series
15
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.
LED Status
Control Status
Probable Cause
Service
Procedure
None, control
LED not on or
flashing
No electrical
power
Control power switch in “OFF” position.
Supply voltage interrupted.
Turn power on
Short flash, once
every four
seconds
Stand-by mode,
Waiting for call
for heat (no fault).
Temperature demand is satisfied
Normal operation.
Adjust thermostat to
temp level.
“Heartbeat”
alternates
bright/dim
Thermostat
calling
for heat (no fault).
Tank temperature below set point of
thermostat.
Normal operation.
Adjust thermostat to
temp level.
Short flash once
per second
Weak pilot signal
on last call for
heat.
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.
Page 19
Two flash, three
second pause
Pressure switch
not working-
closed position.
1. Pressure switch tubing kinked or blocked.
2. Blocked pressure tap on switch or blower.
3. Faulty pressure switch.
Page 20
Three flash,
three second
pause
Pressure switch
or blower temp.
switch not
working -open
position.
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 20
4. Page 22
5 & 6 Page 24
Four flash, three
second pause
Excessive tank
temperature.
System must be
reset.
1. Temperature sensor out of calibration.
2. Faulty gas control.
3. Plumbing leak.
1. Page 25
2. Replace gas control,
page 31
Five flash, three
second pause
Undesired-false
pilot flame
present.
1. Pilot valve stuck in open position.
Replace gas control,
page 31
Troubleshooting
PV Series
15
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.
LED Status
Control Status
Probable Cause
Service
Procedure
None, control
LED not on or
flashing
No electrical
power
Control power switch in “OFF” position.
Supply voltage interrupted.
Turn power on
Short flash, once
every four
seconds
Stand-by mode,
Waiting for call
for heat (no fault).
Temperature demand is satisfied
Normal operation.
Adjust thermostat to
temp level.
“Heartbeat”
alternates
bright/dim
Thermostat
calling
for heat (no fault).
Tank temperature below set point of
thermostat.
Normal operation.
Adjust thermostat to
temp level.
Short flash once
per second
Weak pilot signal
on last call for
heat.
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.
Page 19
Two flash, three
second pause
Pressure switch
not working-
closed position.
1. Pressure switch tubing kinked or blocked.
2. Blocked pressure tap on switch or blower.
3. Faulty pressure switch.
Page 20
Three flash,
three second
pause
Pressure switch
or blower temp.
switch not
working -open
position.
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 20
4. Page 22
5 & 6 Page 24
Four flash, three
second pause
Excessive tank
temperature.
System must be
reset.
1. Temperature sensor out of calibration.
2. Faulty gas control.
3. Plumbing leak.
1. Page 25
2. Replace gas control,
page 31
Five flash, three
second pause
Undesired-false
pilot flame
present.
1. Pilot valve stuck in open position.
Replace gas control,
page 31
15