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| 1. | If the boiler is equipped with High and/or Low gas pressure switches, examine the switch(es) to see if the |
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| yellow LED is illuminated on the switch. If so, correct the gas supply problem associated with the switch and |
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| reset the switch by pressing on the cover of the switch over the red button to reset the switch. Pressing the |
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| button requires a firm push. Push the Reset button on the front panel of the boiler to reset the boiler control. |
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| 2. If the boiler has a UL353 LWCO, check to see if the red LED on the LWCO control box is illuminated. If so, |
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| correct the low water condition and press the reset button on the LWCO control box to reset the LWCO. The |
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| FLUE / GAS PRESS F01 | LED should change to green. Press the reset button on the front panel of the boiler to reset the boiler con- |
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| trol. |
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| 3. Check the flue for obstructions or any sign of damage especially signs of excessive heat. Repair as nec- |
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| essary. Push red reset button on flue temperature switch located on the flue inside the rear access door of |
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| the boiler. NOTE: Switch temperature must be less than 90°F to reset. Run the boiler and check the flue tem- |
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| perature. If the flue temperature is within specs and the switch trips, replace the switch. If the flue temperature |
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| is excessive check and adjust combustion controls on the boiler. If problem persists, inspect the target wall |
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| in the combustion chamber and replace it if cracked or damaged. |
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| 1. Check the electrical connection to the thermistor on the outlet manifold. Verify 5 VDC by checking in Molex |
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| SUPPLY THERMISTR | F02 | connector. If no 5 VDC, check harness. If harness is OK, replace control. Press the reset button on the front |
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| panel of the boiler to reset the boiler control. Verify thermistor values by referencing chart on page 48. |
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| 2. | Replace thermistor if necessary. |
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| 1. Check the electrical connection to the thermistor on the inlet manifold. Verify 5 VDC by checking in Molex |
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| RETURN THERMISTR | F03 | connector. If no 5 VDC, check harness. If harness is OK, replace control. Press the reset button on the front |
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| panel of the boiler to reset the boiler control. Verify thermistor values by referencing chart on page 48. |
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| 2. | Replace thermistor if necessary. |
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| 1. | Check circulation pump operation. |
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| SUPPLY HIGH F05 | 2. Ensure that there is adequate flow through the boiler by accessing the status menu and assuring that there |
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| is less than a 50°F rise from the return thermistor to the supply thermistor. |
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| 3. | Troubleshoot thermistor by following steps in SUPPLY THERMISTR F02. |
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| 1. | Watch the igniter through the observation window provided. |
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| 2. | If there is no spark, check the spark electrode for the proper ¼” gap. Use 2 quarters together as a gauge |
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| NO FLAME F09 |
| to hold igniter against to check gap distance. |
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| 3. Remove any corrosion from the spark electrode and flame rectifier probe. |
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| 4. | If there is a spark but no flame, check the gas supply to the boiler. |
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| 5. | If there is a flame, check the flame sensor. |
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| 6. | Check any flue blockage or condensate blocks. |
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| 1. | Monitor the gas pressure to the unit while in operation. |
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| 2. | Ensure that the flame is stable when lit. |
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| 3. | Check to see if the green light on the display module is out while the boiler is running. |
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| FLAME FAILURE F10 | 4. | If the green light doesn’t come on or goes off during operation check the flame signal on the status menu. |
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| 5. If the signal reads less than 1 microampere, clean the flame rectifier probe. |
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| 6. | If the flame rectifier probe continues to read low, replace it. |
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| 7. Check the stability of the flame rectification signal. If the signal is unstable, you may need to replace the |
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| burner gasket. |
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| 1. | Look into window. If there is flame, turn the gas off to the unit at the service valve and replace gas valve. |
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| 2. | If the flame signal is present and there is no flame, replace the flame rectification probe. |
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| FLAME WHEN OFF | F11 | 3. | If the flame signal is not present after turning off the gas supply, check the gas valve electrical connection. |
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| 4. Remove the valve and check for obstruction in the valve seat or replace the gas valve. |
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| 5. | Turn the gas on at the service valve after corrective action is taken. |
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| 6. Check for condensate back up. Condensate back up can damage the refractory wall, and if the wall falls |
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| against the rectifier probe, it may conduct the signal to ground, giving a false reading. |
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| 1. | Check the combustion air fan wiring. |
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| FAN SPEED ERROR | F13 | 2. Check the 24 VAC signal by measuring from any connected safety to ground. A low voltage situation may |
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| cause a “false” error code. |
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| 3. | Replace the combustion air fan. |
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| 4. | Replace the control board. |
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| CONDENSATE FULL | F20 | 1. | Check condensate lines for obstructions. |
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| 2. Check float switch in condensate reservoir. |
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| 3. | Check wiring from condensate reservoir to control board and repair as necessary. |
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| PROGRAMMED PP | Press ESC/RESET for at least 1 second. |
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| MEMORY ERROR F31 | Control must be |
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