P-K Storm
TM
Gas Fired Boiler
Technical Service 1.877.728.5351
Revised: June 26, 2020
Released: June 26, 2020
©
Patterson-Kelley 2020
All Rights Reserved.
2691000273 P-K Storm ST2500-ST4000
Installation and Owners Manual Rev A.docx
Page 63
physically press the on-
screen or device’s reset button, and automatic reset lockouts which will self-
reset when the error condition clears. For a comprehensive list of errors and potential resolutions, please
refer to the NURO Advanced User’s Guide. Should the unit fail to operate, call a qualified service
technician to troubleshoot the problem and implement corrective actions.
Loss of Power
In the event of a power failure, the NURO touch screen will go dark and the entire boiler will de-
energize. The signal relays used to command auxiliary devices connected to the boiler (air dampers,
pumps, etc.) will also lose power, so these devices will deactivate. When power is restored, the
sequence of operation will resume at Step 3 (
). If any error/lockout errors were present at the time of
the power failure, the NURO control will retain that error/lockout when power is restored.
Loss of Water Level
The low water switch opens when there is an insufficient water level in the boiler. The NURO control
will display 10010:
“Low Water Limit”
, close the gas valve, and lock the boiler out. When the water
level is corrected and the on-screen reset button is pressed, the boiler will reset and resume the
sequence of operation at
Step 3 (
).
Low Gas Pressure
The low gas pressure switch opens when there is (or has been) insufficient gas pressure available for
proper operation of the boiler. If an external gas-supply shut-off valve is closed for any reason, a low
gas condition will result. The NURO control will display 10012:
“Low Gas Limit”
, close the gas valve,
and lock the boiler out. When proper gas pressure is restored, and the on-screen reset button is
pressed, the boiler will reset and resume the sequence of operation at Step 3 (
High Gas Pressure
The high gas pressure switch opens when there is (or has been) excessive gas pressure for the proper
operation of the boiler. The NURO control will display 10011:
“High Gas Limit”
, close the gas valve,
and lock the boiler out. When proper gas pressure is restored, and the on-screen reset button is
pressed, the boiler will reset and resume the sequence of operation at Step 3 (
).
High Water Temperature
When the boiler water has exceeded both the operating temperature limit and the manual reset high-
temperature limit, the NURO control will display 10009:
“High Temperature Limit”
, close the gas
valve, and lock the boiler out. When the water temperature falls below the high-limit temperature
setting, the boiler will remain locked out until the water high-temperature limit switch is manually reset
and the on-screen reset button is pressed. Once reset, the control will resume the sequence of
operation at Step 3 (
Low Air
If the NURO control displays either 65:
“Interrupted Airflow Switch OFF”
or 66:
“Interrupted Airflow
Switch ON”
,
this indicates improper airflow through the boiler. First, verify proper standby blower
operation
– when the boiler is in
“Standby”
, the blower should also be in standby.
Next, check for obstructions of the combustion air intake and/or exhaust (flue) piping. Next, check the
hoses leading to the air switches are not kinked or obstructed. An error related to the air switch does
not necessarily mean that the air switch is defective.
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.
