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Error Text Remedy
OUTDOOR SENSOR FOU
(
Displays only if Screen 21 of the
Installer Menu is ON)
Inspect wiring from outside sensor for damage or shorted connections repairing as necessary. Measure
resistance of outdoor sensor and compare to resistance chart on page 48. If not within range on chart,
shorted or open, replace sensor.
LINE VOLTAGE E19
Inspect power wiring to boiler and repair as necessary. If connected to line voltage, notify power compa-
ny. If connected to alternate power source such as generator or inverter make sure line voltage
frequency supplied by the device is 60 Hz.
BLOCKED VENT FLU
1. Ensure that the flue is not blocked.
2. Check the switch wiring by applying a jumper in place of the switch. If the code clears with the jumper
in place REPLACE the flue switch and connect the wires to the new switch BEFORE running unit.
WARNING: Do not use jumper to remedy this error. Faulty switch MUST be replaced. Failure to
do so could result in serious injury or death.
LOW WATER LEVEL LEO
1. Check boiler feed water system to be sure it is supplying make up water to boiler system.
2. Make sure all air is bled from the system.
3. Check for leaks in boiler and system piping and repair as necessary.
4. Inspect low level switch and wiring for damage and repair as necessary.
24 VOLT LOW LOU
1. Check line voltage. Must be between 100–128 VAC.
2. If available, connect PC and using service software check the 24v supply display in the lower left cor-
ner of the screen. The number displayed here must be greater than 128 and should be greater than 250.
Use this as a troubleshooting guide as you follow the steps below.
3. Remove 10-pin Molex connector from customer connection board. If LOU code clears, then the prob-
lem is with external sensor wiring. Examine external sensor wiring for shorts to ground repairing as
necessary. If LOU code is still present and the boiler is so equipped, disconnect high gas pressure
switch, then low gas pressure switch, then UL 353 low water cutoff in this order one at a time to see if
LOU code clears. Replace faulty part. Check low voltage wire harness in boiler for shorts to ground.
4. If LOU only occurs when burner tries to light, check gas valve for excessive current draw.
5. If LOU is present with the low voltage harness disconnected from the control board, replace the con-
trol board.
LOW WATER FLOW
(if unit is operating)
or
TEMPER BLOCKING
(if Flow Switch is OFF)
1. Check to see if boiler circulator is functioning. Repair as necessary.
2. Make sure water is flowing in the system. Check for valves that should be open, plugged filter screens,
etc.
3. Check flow switch and wiring. Repair as necessary.
HIGH TEMPERATURE F00
1. Check circulation pump operation.
2. Ensure that there is adequate flow through the boiler by accessing the status menu and assuring that
there is less than a 50°F rise from the return thermistor to the supply thermistor.
3. Check thermistor reading on supply thermistor. Replace switch if faulty.
4. If this is a new installation, disconnect the two TT wires from the zone control, and connect the wires
together.
Depress the ESC/RESET button. If the fault clears, the problem is outside the boiler.
XFyre Fault Text
CAUTION: If overheating occurs or the gas supply
fails to shut off, do not turn off electrical power to the
circulating pump. This may aggravate the problem
and increase the likelihood of boiler damage.
Instead, shut off the gas supply to the boiler at the
gas service valve.
CAUTION: Label all wires prior to disconnection
when servicing controls. Wiring errors can cause
improper and dangerous operation. Verify proper
operation after servicing.
WARNING: Do not use this appliance if any part
has been under water. Improper or dangerous
operation may result. Contact a qualified service
technician to inspect the boiler and to repair or
replace any part of the boiler that has been under
water prior to placing the boiler back in operation.
WARNING: When servicing or replacing any
components of this unit be certain that:
• The gas is off.
• All electrical power is disconnected.
NOTE: The onboard fault history only records faults
that lock out the system (FXX faults).