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When a fault condition occurs, the control board goes to
a LOCKOUT mode. When in the LOCKOUT mode, the
green LED located on the Control board will flash a fault
code. The number of times of LED flashes ON/OFF will
determine
the nature of the fault (see the table below).
To reset the Control from the LOCKOUT state, remove
and re-apply 120VAC line power to the Control board.
D_scfintion
of Fault
# of LED Pulses
Limit String Open
....................
2
Flame Stuck ON ......................
3
Ignition Fault (No Flame) ................
4
Return Water Temperature
Thermistor
Fault . .5
Supply Water Temperature
Thermistor
Fault . .6
Air Pressure Switch Fault, Stuck Closed
.....
7
Air Pressure Switch Fault, Stuck Open
......
8
Redundant
Gas Valve Relay Stuck ON ......
9
Gas Valve Relay Stuck ON
..............
9
Redundant
Gas Valve Relay Stuck OFF
....
10
Gas Valve Relay Stuck OFF .............
10
Gas Valve wire disconnected
............
11
ROM Checksum
Failure ................
12
RAM Test Failure .....................
13
60 Hz Failure
.......................
14
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1. LIMIT STRING OPEN - 2 PULSES
(Thermodisc
Temp Switch, Water Pressure Switch,
High Limit Switch)
If the limit string opens, the control will immediately
remove power to the gas valve, complete a post
purge cycle, and enter lockout mode. To restart the
control, make sure that there is a least 10 PSI in the
water system. Allow boiler water temperature
to cool
below control setpoint less the differential, press reset
buflon of thermodisc
temperature
switch, then
remove and re-apply 120 VAC line power.
2. Flame Stuck ON - 3 PULSES
3.
The current state of the flame may be determined
by
looking through the view port on the combustion
chamber.
If the flame is stuck ON/OFF then the
flame rod insulator or the connector CN6 may not
be clean, or unplugged.
Ignition Failure (No Flame) - 4 PULSES
If an ignition failure occurs during the trial-for-
ignition, the control will return to the pre-purge
state
and attempt another ignition trial. If after three trials
an ignition failure is still occurring, the control will go
into the lockout mode.
a. Check that the gas valve is operating correctly
and the electrical plug is fully connected
into the
valve.
b. Verify that the gas supply is turned on.
c. Check for proper connection to the 120VAC
line source.
d. Check that the flame rod is connected,
and also
that the flame rod is clean.
e.
If items "a" through "d" are correct replace the
Low-Voltage Cable assembly.
4. Open Return Water Temperature
Thermistor
-
5 PULSES
The control will sense an open temperature
thermistor
If an open thermistor is sensed, the
conttol will go into the lockout state.
a. Verify that the return thermistor wiring is properly
connected
to the control.
b. If the temperature thermistor is in any
environment
of less then 0° F then wait for
ambient temperature
to rise, or apply heat to
the unit.
c.
If the temperature
thermistor is in an
environment
of more then 230 ° F then wait for
the temperature
to drop below 200 ° F
5. Open Supply Water Temperature
Thermistor
-
6 PULSES
The control will sense an open temperature
thermistor. If an open thermistor is sensed, the
control will go into the lockout state.
a.
Verify that the return thermistor wiring is properly
connected
to the control board.
b.
If the temperature
thermistor
is in an
environment
of less then 0 ° F then wait for
ambient temperature
to rise, or apply heat to
the unit.
c. If the temperature
thermistor is in an
environment
of more then 230 ° F then wait for
the temperature
to drop below 200 ° F
6. Air Pressure Switch Fault Stuck Closed - 7 PULSES
If the control senses the blower pressure switch is
closed when it is expected
to be open, the control
will wait approximately
90 seconds for the fault
condition to clear. If after approximately
90 seconds
the control still senses the blower pressure switch is
closed, the control will go into the lockout state.
a. Verify that the blower motor is operational
and
that the 120 VAC power cable is connected
to
the blower.
b.
c.
Check that the wires are connected
to the blower
air pressure switch and that the air pressure
switch is functional. This may require turning the
screw in the center of the air pressure switch I
turn clockwise to correct (initial set-up only).
After any air pressure switch adjustment,
you
must cycle the appliance
several times to insure
proper operation.
22
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