Panasonic Shows U-26PE1U6 Technical Data & Service Manual

Also see for : S-26PU1U6: Installation instructions Quick guide Operating instructions Technical data & service manual Installation instructions

Contents

Panasonic Shows U-26PE1U6 Technical Data & Service Manual Manual pdf 169 page image

4-54. Service procedures4-2. Symptoms and Parts to InspectJudgment condition Clear conditionP03P05P04P15P19P20P22P26Remotecontrolleralarm displayAlarmcontents Judgment andcorrectionAbnormal dischargetemperature• Discharge temp.detected at orabove the specifiedvalue.Stops when temp. exceeds232 ˚F.Recovery at restartRecovery at restartRecovery at restartRecovery at restartRecovery at restartRecovery at restartRecovery at restartRecovery at restart1. Check refrigerant cycle(gas leak).2. Electronic control valvetrouble3. Check tubing sensor (TD).Missing phaseHigh pressureswitch is activated.Compressor motorthermal protector isactivated.detected. (CTdisconnected or ACpower trouble)Current value sent from MDCStops when pressureexceeds 600 psi.Stops when temp. exceeds230 ˚F.on outdoor unit control PCB islow.No AC power input for 3minutes or longer: pre-trip - 51. Check R/S/T power.2. Check inverter control PCB.3. Check outdoor unit controlPCB.Insufficient gas leveldetected.The following conditionscontinue for 1 minute.• Discharge temp. is 203 ˚F orhigher.• Electronic control valve is atstep 480.• Current value from MDC is2.0 A or less.Check refrigerant cycle(gas leak).4-way valve locked• Judgment occursafter compressorhas been ON for 5minutes.Indoor heat exchanger temp.drops although compressorsare ON in heating mode:[min(E1, E2)] ≤ 50 ˚F.Indoor heat exchanger temp.rises although compressors areON in cooling mode:E2 ≥ 104 ˚F.1. Check 4-way valve.2. Check 4-way valve wiring.3. Check outdoor unit controlPCB.High-pressureprotection trouble1. Refrigerant cycleoverload operation2. Outdoor coil temperaturesensor C1 or C2Outdoor unit fanmotor trouble• Inverter protectioncircuit wasactivated, or lockwas detected, atoutdoor unit fanmotor.Inverter stops after alarm isdetected1. Position detection trouble2. Overcurrent protectioncircuit at outdoor unit fanmotor was activated.• Check outdoor unit controlPCB.• Refer to outdoor unit fanjudgment methods.Inverter protectioncircuit wasactivated, or G-Trshort-circuit (shorttime: 0.8 s or less)in inverter controlInverter stops after alarm isdetected. Alarm is outputwhen inverter stops (pre-trip)consecutively 4 times.1. Stops immediately whenrestarted.• Layer short in thecompressor2. Check inverter controlPCB.• Wiring trouble1. Check the high pressureswitch connector issecurely connected.2. Check the ourdoor unit heatexchanger is not clogged(cooling operation).3. Check the indoor unit airfilter has not becomeclogged (heating operation)If MAX (C1,C2) is 142°F orhigher, the compressor stopsone. The compressor restartsthree time, and if thetemperature does notdecrease to less than 142°F,the alert “P20” is displayed.4