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Trane heat pump showing code 1 flash (outdoor) on the Trane heat pump / AC outdoor unit control board LED? On the Trane heat pump outdoor-unit control board, a single LED flash indicates the low-pressure switch is open — system refrigerant pressure has dropped below the safe threshold. The compressor is typically protected/locked out, so no cooling or heat-pump heating is produced. Here is what it means, what you can safely check, and when to call a licensed CANRO technician in an urgent 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 heat pump. 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 heat pump guides and services or browse all HVAC error codes we fix.
Applies to Trane Trane heat pump / AC outdoor unit control board LED. 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.
“Canro does an amazing job! Super professional and skilled with everything—boilers, furnaces, and AC. Always a pleasure working with them!”
“Five stars for Canro. We needed a replacement of a 30-year-old boiler. A new high-efficiency unit was installed—clean, professional work.”
“I can’t speak highly enough about George, who was recommended for a boiler service call for my parents’ home. George is excellent.”
25+ years keeping Metro Vancouver homes comfortable. Honest advice, upfront pricing, work that lasts.