Circuit Diagram; Troubleshooting - Newmac NM-75K Operating Instructions Manual

Oil Shortage
Bad Photocell (Flame Sensor)
E1
Incomplete Combustion
Contamination of Fuel Filter
Ignition Failure
E2
Bad Connection or mis-operation of Sensor
LO Below 1°F
HI Over 99°F
OH It stops when the temperature reaches to 140°F
CN Continuously operating without set-temperature Normal
Blinking Error during operation

Circuit Diagram

NM-75K, NM-125K, NM-175K, NM-215K

Troubleshooting

Possible Cause
Photocell (Flame Color Checking Sensor) Error
Temperature sensor (Thermister) Error
Corrective Action
Charge Fuel (Fill the fuel if needed)
Check and clean or replace Photocell (Flame Sensor)
Using Designated Fuel
Clean or replace Fuel Filter
Check Wire Connection
Check Spark Plug For Normal Firing (clean or replace if
needed)
Checking Wire Connection
Replace Sensor
Normal
Normal
Restart After Cooling
Check Error Code
Restart after resetting
-13-
Power Plug