Visit www.carrier.com Troubleshooting Guide

58 MVPV ariable- speed 2-StageElectronic Condensing FurnaceTroubleshooting GuideNOTE:Read the entire instruction manual before starting CONSIDERATIONSINDEXPAGEI nstructions ..1 Example ..2 Sequence of Mode-Two Heat Mode ..3 Heat Pump Fan Mode ..4 Component Humidifier Mode ..5 Zone Mode ..5 Start Label/Fault Code Instructions ..7-8 Improper Operation With No Flashing Fault Code ..9 Not Enough Cooling Airflow ..10 High-Fire Temperature Rise Too Low (Cold Blow) ..11 LEDs 1, 2, 3, or 4 On LED2 Flashing ..12 Fault Code 11 No Fault in Recent History Display ..13 Fault Code 12 Blower Calibration Code 13 Limit Switch Code 14 Ignition Code 21 Invalid Model Code 22 Set Up Code 23 Invalid Blower Airflow Selection ..18 Fault Code 24 Secondary Voltage Fuse Is Code 31 High-Pressure Switch Code 32 Low-Pressure Switch Fault ..23-24 Fault Code 33 Limit Switch Code 34 Ignition Proving Fault ..26-27 Fault Code 41 Blower Outside Valid speed Range.

1. Prepurge period—The inducer motor is turned on IMMEDI-ATELY operating at maximum speed, closing low- and high-pressure switches. Prepurge begins 25 sec after high-pressure switch closes. 2. Blower on—The blower motor is turned on IMMEDIATELY and slowly increases to maximum speed as soon as a call for heat is received. No blower ...

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