69
F01
ECO circuit 2
Vent temperature
High Gas Pressure (if
equipped)
Low gas pressure (if
equipped)
Low level (if equipped with
UL353 LWCO)
1. If the boiler is equipped with High and/or Low gas pressure switches, examine the
yellow LED lights on each switch. If lit, correct the gas supply problem associated with
the switch. Then, reset the switch by pressing on the cover of the switch over the red
button. Pressing the button requires a firm push. Finally, press the RESET button on the
front panel of the boiler to reset the boiler control.
2. If the boiler has a UL353 LWCO, check to see if the red LED on the LWCO control
box is illuminated. If so, correct the low water condition and press the reset button on the
LWCO control box to reset it. The LED should change to green. Finally, press the reset
button on the front panel of the boiler to reset the boiler control.
3.Check the flue for obstructions or any sign of damage, especially signs of excessive
heat. Repair as necessary. Push red reset button on flue temperature switch located on
the flue inside the rear access door of the boiler. NOTE: Switch temperature must be
less than 90oF to reset. Run the boiler and check the flue temperature. If the flue
temperature is within specs and the switch trips, replace the switch. If the flue
temperature is excessive, check and adjust the combustion controls on the boiler. If
problem persists, inspect the target wall in the combustion chamber and replace it if
cracked or damaged.
F02
Interrupted or shorted supply
(outlet) thermistor.
1. Check the electrical connection to the appropriate thermistor. Verify 5 VDC by
checking in Molex connector. If not 5 VDC, check harness. If harness is OK, replace
control. NOTE: Boiler will reset automatically. Verify thermistor values by referencing
chart in this manual.
2. If connection is okay, replace thermistor.
F03
Interrupted or shorted return
(inlet) thermistor.
F05
Supply (outlet) temperature
sensor exceeds 230
o
F.
1. Check circulation pump operation.
2. Assure there is adequate flow through the boiler by accessing the status menu and
assuring that there is less than a 50
o
F rise from the return thermistor to the supply
thermistor.
3. Check direction of flow on boiler circulator (see PIPING DETAILS in this manual).
4. Troubleshoot thermistor by following steps in F02.
F06
Return (inlet) temperature
sensor exceeds 230
o
F.
F09
No flame detected – Boiler
will make three attempts at
ignition before the control
goes into this lockout
condition.
1. Watch the igniter through the observation window provided.
2. If there is no spark, check the spark electrode for the proper ¼” gap.
3. Remove any corrosion from the spark electrode and flame rectifier probe.
4. If there is a spark but no flame, check the gas supply to the boiler.
5. If there is a flame, check the flame sensor.
6. Check any flue blockage or condensate blocks.
F10
Loss of flame signal – The
heater will relight 4 times
before the control goes into
this lockout condition. Will
reset in 1 hour.
1. Monitor the gas pressure to the unit while in operation.
2. Assure that the flame is stable when lit.
3. Check to see if the green light on the display module is out while the heater is running.
4. If the green light doesn’t come on or goes off during operation check the flame signal
on the status menu.
5. If the signal reads less than 1 microampere, clean the flame rectifier probe.
6. If the flame rectifier probe continues to read low, replace it.
7. Check the stability of the flame rectification signal. If the signal is unstable, you may
need to replace the burner gasket.
F11F
False flame signal – The
boiler will lock out if it senses
a flame signal when there
should be none present.
1. Look into window. If there is flame, turn the gas off to the unit at the service valve and
replace gas valve.
2. If the flame signal is present and there is no flame, replace the flame rectification
probe.
3. If the flame signal is not present after turning off the gas supply, check the gas valve
electrical connection.
4. Remove the gas valve and check for obstruction in the valve seat or replace the gas
valve.
5. Turn the gas on at the service valve after corrective action is taken.
6. Check for condensate backup. Condensate backup can damage the refractory wall. If
the wall falls against the rectifier probe, it may conduct the signal to ground, giving a
F13
incorrect – The boiler will
lock out if it senses that the
fan speed is less than 70%
or greater than 130% of
expected rate for more than
1. Check the combustion air fan wiring.
2. Check the 24 VAC signal by measuring from any connected safety to ground. A low
voltage situation may cause a “false” error code.
2. Replace the combustion air fan.
3. Replace the control board.
F20 Condensate cup is full
1. Check condensate lines for obstructions.
2. Check float switch in condensate reservoir.
3. Check wiring from condensate reservoir to 926 control and repair as necessary.
pp Parameters programmed Press {S4} reset for at least 1 second.
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