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Every common Tempstar fault code with what it means, the likely cause, and how CANRO Heating & Cooling fixes it — servicing Tempstar furnaces, air conditioners and heat pumps across Greater Vancouver since 1999. Licensed Technical Safety BC contractor (gas LGA0043870 · boiler LBP0046450).
Tempstar furnaces flash a status code on the control-board LED. Tempstar is an ICP (Carrier-owned) brand and shares the Carrier/Bryant status-code system.
Important: One power-cycle reset is generally safe for a transient fault. If the same code returns within minutes, stop resetting — lockouts exist to protect the heat exchanger, ignition system and gas-valve safety circuit. Note the exact code and call CANRO at (604) 359-1081. We carry common Tempstar parts on every truck, so most code-triggered faults are fixed in one visit. Smell gas? Leave and call the gas utility emergency line first.
What it means: Furnace locked out after the limit circuit stayed open too long (1-hour auto-reset).
Common causes: Overheating from restricted airflow — dirty filter, blocked returns, closed registers, failed blower.
What to do: Replace the filter and clear vents; if it returns, call. Repeated overheating damages the heat exchanger.
Reset guidance: auto after 1 hr
What it means: No flame established after the maximum ignition attempts (3-hour auto-reset).
Common causes: Dirty/failed flame sensor, weak igniter, low gas pressure, gas valve, condensate-blocked pressure switch.
What to do: Note the code and call — one power-cycle reset is OK once.
Reset guidance: one cycle OK
What it means: Flame signal present when it should not be, or implausible.
Common causes: Sticking gas valve, flame-sensor/grounding fault, control issue.
What to do: Shut the furnace off and call — abnormal flame proving is a safety fault.
Reset guidance: no
What it means: Pressure switch stuck closed on a two-stage unit.
Common causes: Stuck switch, wiring, control board.
What to do: Service.
Reset guidance: no
What it means: Combustion-air or draft pressure switch never proved.
Common causes: Blocked vent/intake (snow, debris, nest), condensate trap blockage, weak inducer, switch/tubing fault.
What to do: Check the outdoor vent terminal if safe; otherwise call.
Reset guidance: no
What it means: Open high-limit, rollout switch, or flame-rollout trip.
Common causes: Restricted airflow, blocked flue, failed limit/rollout — a rollout trip can indicate a cracked heat exchanger.
What to do: Stop using it and call — rollout trips are a safety concern.
Reset guidance: no
What it means: Flame was established but lost during the trial-for-ignition.
Common causes: Dirty flame sensor (most common), low gas pressure, marginal igniter, polarity/grounding.
What to do: One cycle reset OK; recurring needs a flame-sensor clean/service.
Reset guidance: one cycle OK
What it means: ECM/PSC blower motor speed or signal out of range.
Common causes: Failed motor or module, wiring, capacitor (PSC).
What to do: Service.
Reset guidance: no
What it means: Internal control-board hardware fault.
Common causes: Failed control board.
What to do: Board replacement.
Reset guidance: no
What it means: Communicating systems show a specific code on the thermostat; older units trip the contactor/board.
Common causes: Low refrigerant, capacitor, contactor, reversing valve, defrost board, compressor.
What to do: Read the thermostat code and call — refrigerant work is licensed.
Reset guidance: no
CANRO offers same-day and after-hours emergency repair across Greater Vancouver — no-heat, no-cooling and no-hot-water calls are prioritized. Note your code and call now.
📞 Call (604) 359-1081 — emergency Tempstar repairOur licensed Red Seal technicians diagnose and repair Tempstar furnaces, air conditioners and heat pumps in every Metro Vancouver city — Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North & West Vancouver, New Westminster, Delta, Langley, Port Moody, Port Coquitlam, White Rock, Pitt Meadows and Maple Ridge — with honest, up-front pricing and a 4.9-star rating from 85+ Google reviews.
This Tempstar error-code guide is maintained by the CANRO Heating & Cooling team from 25+ years of HVAC install, service and repair across Greater Vancouver. Flash-count and code behaviour described match current Tempstar model manuals; exact codes can vary by model and series, so confirm against your unit’s manual or tell us the code when you call. Last reviewed June 2026.
Each Tempstar code points to a specific fault — ignition, pressure/draft, high-limit, flame-sensing, blower or communication. The guide above lists each one with its cause and fix. Tell us the exact code when you call (604) 359-1081 and we usually know the likely cause before arriving.
One power-cycle reset is fine for a one-off fault. If the same code returns within minutes, stop — repeated resets stress the ignition, gas-valve and heat-exchanger safety circuits. Note the code and call.
Yes — CANRO offers same-day and after-hours emergency response across Greater Vancouver, and we carry common Tempstar parts so most code faults are fixed in one visit. Call (604) 359-1081.
Yes — Technical Safety BC gas contractor LGA0043870 and boiler licence LBP0046450, Red Seal technicians, fully insured, serving Greater 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.