Pelpro PPC90 Service Manual page 5

PELPRO TROUBLESHOOTING MANUAL
INTRODUCTION
The purpose of this troubleshooting guide is to provide step by step procedures for diagnosing issues with the PelPRO
PPC90 and TSC90. A digital or analog multimeter will be required for many of the troubleshooting steps in this guide.
When troubleshooting with the multimeter, it's important to disconnect the appliance from wall power while locating the
electrical connections that need to be checked. Connect the multimeter to the test locations detailed in this guide and then
plug the appliance back into wall power. Take care to avoid letting any exposed wires or connectors from contacting the
metal chassis of the Appliance or from touching exposed skin. The appliance is energized with 115VAC power from the wall
and there is a risk of shock or electrocution. If you are not familiar or comfortable working with energized electrical circuits,
please contact a certified NFI Installer or certified electrician to complete that portion of troubleshooting.
When instructed to check a appliance for power from the control board, the multimeter will need to be set to check Voltage,
often displayed as "V" on the meter. If the meter is not auto-sensing, AC voltage will need to be chosen when specified in
the instructions. AC voltage is also sometimes shown as ~ V on multimeters. If instructed to check VDC, DC voltage will
have to be chosen on the multimeter. Voltage checks are typically used when motors and blowers are not running and we
are attempting to determine if the component is bad or is the control board is not sending power to the component.
Some components can be verified for functionality by checking the resistance of the part. Igniters and fuses are the most
common parts that can be verified by resistance checking with a multimeter. Resistance is measured in ohms (Ω) and
most multimeters will have that symbol next to the resistance setting. Unlike voltage, resistance is always measured with
the appliance completely deenergized from wall power. There is no risk of shock or electrocution when the appliance is
unplugged from wall power and components are being verified for resistance. When resistance is being checked, this
manual will provide an expected resistance in Ω, however a number slightly above or below the specified value does not
indicate a bad component. If the multimeter shows MAX or Out of Range, this indicates infinite resistance, meaning an open
circuit and a bad component. A resistance of 0 ohms for a component indicates an electric short circuit and again a bad
component.
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