Error Text
Diagnosis & Recommended
Troubleshooting
Inlet Pres. Sensor
Check that the Inlet Pressure Sensor is
connected properly. It may need replacing.
Check the connector on the back of the circuit
board.
Other message that may display: Inlet Pres.
Sensor.
Ignition Module
Other message that may display
simultaneously: Low Module Current.
1. Check the gas flow. Open the manual
gas shutoff, if necessary.
2. See Resetting a boiler after a SIM module
ignition lockout on page 85.
See About Status indicators on page 11.
Low Water Pressure
Check for a plugged or dirty water sensor part.
Max deltaT Exceeded
This may be a temporary condition that may
clear automatically.
Check the Specifications table for the
boiler to ensure the maximum ΔT is not
exceeded.
The water flow in the pumps may be too
low. Check that the water pumps are
functioning properly.
Check the Specifications table that the
flow is higher than the minimum boiler
flow rate. Other message that may
display simultaneously: No/Low Water
Flow.
Failed primary boiler pump.
Blown primary pump fuse on the main
control board.
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