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Pareto — Heat Pump Warranty Claims

First-year warranty claims on an air-source heat pump range by failing subassembly, computing that 5 of 10 modes carry 83.8% of 2,345 claims and showing the expansion valve overtaking the outdoor fan motor.

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Warranty claims by failing subassembly — 7 kW air-source rangeModel year 2026 vs Model year 2025 · 10 categories · total 2,345 claims · threshold 80%Model year 2026Model year 2025Cumulative %Cumulative % (Model year 2025)02004006008000%20%40%60%80%100%80% threshold6142885025473884012742621861731522099710413213626.2%47.6%64.1%75.8%83.8%90.2%94.4%100%vital few · 5Electronic expansion valveOutdoor fan motorInverter control boardFour-way reversing valvePlate heat exchangerRefrigerant charge lossDefrost sensorOther5 of 10 categories (50%) account for 83.8% of 2,345 claims.Vital few at 80%: Electronic expansion valve, Outdoor fan motor, Inverter control board, Four-way reversing valve, Plateheat exchanger — 1,964 of 2,345 claims.Those categories covered 78.8% of the Model year 2025 total (2,120 claims), against 83.8% of Model year 2026.Movement vs Model year 2025: entered — Plate heat exchanger; left — Refrigerant charge loss.Other folds 3 categories past the bar limit (132 claims, 5.6%).Claims inside the first 12 months on 41,300 units shipped

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title "Warranty claims by failing subassembly — 7 kW air-source range"
unit claims
period "Model year 2026"
compare "Model year 2025"
threshold 80%
max-bars 8
note "Claims inside the first 12 months on 41,300 units shipped"

# subassembly                       MY2026   MY2025
"Electronic expansion valve"           614      288
"Outdoor fan motor"                    502      547
"Inverter control board"               388      401
"Four-way reversing valve"             274      262
"Plate heat exchanger"                 186      173
"Refrigerant charge loss"              152      209
"Defrost sensor"                        97      104
"Condensate tray heater"                63       58
"Vibration isolator"                    41       47
"Cabinet corrosion"                     28       31