Navien NPE-180A Service Manual

Also see for NPE-180A: Installation manual Installation & operation manual Specification sheet Installation manual Operation manual

Contents

Navien NPE-180A Service Manual Manual pdf 97 page image

Version 2.2196 NPE Service Manual5.1.9 109ErrorError occurrence conditions and check itemsError DescriptionE109Fan motor RPM errorThe system checks the RPM signal after the fan starts to run, and displays the error message 109E (clearedmanually) in the following cases:1. If the RPM remains low or close to 0, the system determines RPM error, and the water heater switches intoLock-Out (gas valve and ignition transformer locked). (However, the air pressure sensor should be normal.)2. If the RPM signal of low or close to 0, is detected for 3 seconds during combustion, the system stopscombustion, and the water heater switches into Lock-Out. (However, the air volume sensor should benormal.)Check items1. Check if the fan motor works normally using the component test mode (refer to page 47).2. Check the power supply to the fan (Black + Red, approx. DC 127~184 V)3. If RPM is significantly low while the fan works and the power supply is normal, replace the fan motor.4. If the fan connector is wet due to any reason including leakage, take corrective action by powering the unitOFF, then drying the components completely before continuing operation.5. Check for loose connection of white connector that attaches the fan motor to the PCB.Check fan assemblyCheck power and connectorCheck the PCBCheck the voltage between #3 and #5 CON 11:127-184V DC (check page 52 for Wiring Diagram)Check the voltage between #3 and #7 CON 11:0-7.5V DCNONOYesYesDoes the fan motorhave nominal operationvoltage?Is there any voltage fromthe fan motor?