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Heil air conditioner showing code Yellow ALERT — 1 flash on the Heil outdoor unit — compressor monitor / Comfort Alert module? The compressor monitor flashes the yellow ALERT once to indicate a long run time — the compressor is running extremely long cycles, commonly caused by a low refrigerant charge so the system cannot reach setpoint. Here is what it means, what you can safely check, and when to call a licensed CANRO technician in a situation across Metro Vancouver.
What not to touch: beyond these checks, do not open the unit or touch the gas valve, wiring, control board or refrigerant lines. In BC, gas and HVAC repairs must be done by a licensed technician — both for your safety and to keep your manufacturer warranty valid.
Same-day diagnosis across Metro Vancouver. We carry common parts and quote up front.
📞 (604) 359-1081 Request a quoteA single fault code rarely means you need a new air conditioner. The deciding factors are the unit’s age, the cost of the failed component versus its efficiency, and whether it’s a recurring problem. Our technicians give you an honest diagnosis and a written repair-or-replace recommendation — never a scare-sell. Explore more air conditioner guides and services or browse all HVAC error codes we fix.
Applies to Heil Heil outdoor unit — compressor monitor / Comfort Alert module. Code behaviour can vary by model and control board — our technician confirms the exact cause against your unit before any repair.
CANRO Heating & Cooling — TSBC Class-A gas-fitting licence · Red Seal HVAC certified · WorkSafeBC and liability insured · 4.9★ from 85+ Google reviews · Serving Metro Vancouver since 1999.
See every HVAC error code we diagnose, or book Heil air conditioner repair across Metro Vancouver. No heat or cooling right now? Call CANRO at (604) 359-1081 for same-day and after-hours service.
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25+ years keeping Metro Vancouver homes comfortable. Honest advice, upfront pricing, work that lasts.