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When 66: "Interrupted Airflow Switch ON" is displayed, check that the air switch is open when the blower
is offline. Ensure there is no air flow through the boiler when the blower is offline. An excessive negative draft
in the flue piping can cause air flow through the offline boiler which may be strong enough to maintain closure
of the air switch.
When 65: "Interrupted Airflow Switch OFF" is displayed, check that the air switch is closed when the
blower is running. If the air switch does not close within 5 minutes during purge, the boiler locks out. Check
that the burner is clean (Cleaning the Burner,
intake or exhaust ducts.
5.6.7 Flame Failure
In the event of a flame failure, the NURO control may display one of the following error messages:
106: "Flame Lost in Main Flame Establish Period"
•
107: "Flame Lost Early in Run"
•
108: "Flame Lost in Run"
•
109: "Ignition Failed"
•
110: "Ignition Failure Occurred"
•
When 109: "Ignition Failed" or 110: "Ignition Failure Occurred" is displayed, the boiler did not light during
the trial for ignition. Check that the ignition electrode, ignition wire, and gas valve are functioning properly.
Check that the direct spark ignition is visible through the flame observation port during the trial for ignition.
When 106: "Flame Lost in Main Flame Establish Period", 107: "Flame Lost Early in Run", or 108: "Flame
Lost in Run" is displayed, the boiler lost the flame signal during operation. Check that combustion is adjusted
properly, the gas pressure is correct, and the ignition electrode, ignition wire, and gas valve are functioning
properly.
5.6.8 Flame Error
In the event of a flame error (premature or late flame signal), the NURO control will display 105: "Flame
Detected Out of Sequence". This may be caused by a failed/leaky gas valve or a flame rod or ionization rod
malfunction. If gas valve leakage is suspected, the unit must be isolated by turning off the main gas supply
line. Lockout/tagout the boiler until qualified and knowledgeable service personnel are available to evaluate
and repair or replace the failed parts. Check that the incoming gas pressures have not exceeded 14"
(1/2 psig).
5.6.9 Flue Problem
When the normally-closed high exhaust back pressure switch opens, the NURO control will display 10013:
"High Back Pressure Limit". This may be caused by an obstruction in the flue piping, an obstruction in the
combustion air intake, or a blocked condensate system. When the blockage is removed, the boiler will
automatically restart. If no blockage is found, it may be necessary to replace the high exhaust back pressure
switch.
6 Parts/Technical Support
Spare parts and replacement parts can be ordered from Harsco
Industrial, Patterson-Kelley by calling toll free (877) 728-5351.
Reach us by fax at (570) 476-7247.
Refer to the parts list shown on the assembly drawings provided in
this manual.
T T T T echnical Service 1.877.728.5351
echnical Service 1.877.728.5351
echnical Service 1.877.728.5351
echnical Service 1.877.728.5351
Section
5.3) and that there are no obstructions to airflow in the
TM
P-K SONIC
Gas Fired Boiler
Use of Non-Factory Authorized
replacement parts are not
recommended for this equipment.
All control components are
engineered for safety and are
designed to work in unison with
each of the other components.
Use of non-factory authorized
replacement parts jeopardizes the
functionality of the safety
W.C.
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