Allied Error Code 1 flash: Flame sensed with gas valve off (Furnace)
Allied error code 1 flash on a furnace means: Flame sensed with gas valve off. It is also called Allied diagnostic code 1 flash.
Homeowner? What Allied code 1 flash means for you
Stop and call Your furnace is reporting: Flame sensed with gas valve off. This code is a safety shutdown. Turn the furnace off and call a licensed technician. Do not keep resetting it. If you smell gas, leave the house and call your gas utility or 911 from outside.
Safe things you can check yourself
- Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
- Make sure the unit has power: its on/off switch (often looks like a light switch near the unit) is ON and the breaker in the electrical panel is not tripped.
Call (647) 657-2977Book a service call
Licensed technicians serving Vaughan, Toronto and the GTA.
What does Allied error code 1 flash mean?
The control sees flame while the gas valve is supposed to be closed. Code listed only in the manual; no causes or steps given.
Applies to: A95UH, A93UH, 95G1UH, 92G1UH (sizes 045-08 to 135-20)
Allied models that use code 1 flash
92G1UH92G1UH0450892G1UH0451292G1UH0700892G1UH0701292G1UH0901292G1UH0901692G1UH1101692G1UH1102092G1UH1352095G1UHA93UHA93UH1DA95UHA95UH1D
Other Allied Furnace codes
All Allied Furnace error codes →
Allied code 1 flash: homeowner questions
What does Allied code 1 flash mean?
Flame sensed with gas valve off. The control sees flame while the gas valve is supposed to be closed. Code listed only in the manual; no causes or steps given.
Is it safe to keep using my furnace with code 1 flash?
No. Code 1 flash is a safety shutdown, so keep the furnace off until a licensed technician has checked it.
Can I reset Allied code 1 flash myself?
Do not keep resetting it. Repeated resets can hide a safety problem; a licensed technician needs to find the cause.
Who can fix Allied code 1 flash near me?
Aurora Star Tech Inc. repairs Allied furnaces in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.
Homeowner help: Furnace Not Turning On: What to Check · Furnace Blinking Light: What the Flash Codes Mean
Troubleshooting guides
- Blower cycles on and off All brands · Furnace
- Blower runs, not enough heat All brands · Furnace
- Blowing cold air All brands · Furnace
- Board shows "flame sensed with no call for heat" All brands · Furnace
- Can't pull oil (distance/lift) All brands · Furnace
- CO in flue / poor combustion numbers All brands · Furnace
- Cold air blast at start / blower never stops All brands · Furnace
- Combustion gas / odour in house, flu-like symptoms All brands · Furnace
- Cycles on limit (not lockout) All brands · Furnace
- Does not start All brands · Furnace
- Flame burns a few seconds then out All brands · Furnace
- Flame conditions table All brands · Furnace
- Heat exchanger leak All brands · Furnace
- High blower-door ACH50 (>3) All brands · Furnace
- High fuel consumption All brands · Furnace
- High stack temperature All brands · Furnace
- High stack temperature / low efficiency All brands · Furnace
- Indoor blower runs, outdoor unit dead All brands · Furnace
- Limit opens All brands · Furnace
- Locks out — oil but no ignition All brands · Furnace
- Low CO2 (<8 %) All brands · Furnace
- Low draft / blowback All brands · Furnace
- Modulating furnace won't modulate All brands · Furnace
- Negative house pressure, backdrafting, infiltration All brands · Furnace
- No heat All brands · Furnace
- No heat (ignition stage) All brands · Furnace
- Noisy All brands · Furnace
- Noisy registers, drafts, blower overamps/ECM noise, coil freezing All brands · Furnace
- Not running / fault code All brands · Furnace
- Oil + ignition OK but no flame All brands · Furnace
- Oil on floor All brands · Furnace
- Pressure switch open / stuck All brands · Furnace
- Puff-back / delayed ignition All brands · Furnace
- Reduced airflow, hot motor All brands · Furnace
- Reduced pressure, smoky shutdowns, lockouts All brands · Furnace
- Rollout switch tripped All brands · Furnace
- Short cycling All brands · Furnace
- Smoke, soot, odour, pulsation All brands · Furnace
- Starts but locks out — no oil at nozzle All brands · Furnace
- Too little / too much air All brands · Furnace
- Unsatisfactory heat (short cycles / uneven / not enough) All brands · Furnace
- Water flows with furnace off All brands · Furnace
- Annual planned service inspection Allied · Furnace
- Annual service checklist Allied · Furnace
- Blower access panel and carbon monoxide hazard Allied · Furnace
- Burner assembly cleaning Allied · Furnace
- Canadian installations: combustion air to other appliance clearance Allied · Furnace
- Change blower speed tap Allied · Furnace
- Check gas connections for leaks Allied · Furnace
- Check temperature rise and adjust blower speed Allied · Furnace
- Check venting and combustion air on non-direct vent installs Allied · Furnace
- Checking a shared vent after this furnace is removed or replaced Allied · Furnace
- Checking gas flow rate (approximate) Allied · Furnace
- Clean the burner assembly Allied · Furnace
- Clean the heat exchanger Allied · Furnace
- Combustion check Allied · Furnace
- Conditions for using the furnace as a construction heater Allied · Furnace
- Direct vent termination layout (roof and sidewall) Allied · Furnace
- Do not vent into an existing stack or use screens Allied · Furnace
- Duct static limit for heating mode Allied · Furnace
- EAC and HUM accessory terminals on the control board Allied · Furnace
- Electrical checks on the furnace Allied · Furnace
- Electrostatic discharge (ESD) precautions Allied · Furnace
- Exhaust and air intake pipe check during startup Allied · Furnace
- Exhaust pipe transitions and sizing Allied · Furnace
- Exhaust piping installation Allied · Furnace
- Exhaust tee and direction notes Allied · Furnace
- Exhaust transitions in upflow and horizontal runs Allied · Furnace
- Field electrical connections and overcurrent protection Allied · Furnace
- Gas piping layout (left side, right side, horizontal) Allied · Furnace
- Gas type approval and LP conversion Allied · Furnace
- Gas valve connection torque Allied · Furnace
- Gas valve lighting procedure Allied · Furnace
- Gas valve pressure testing Allied · Furnace
- General vent termination requirements Allied · Furnace
- Heat exchanger removal, cleaning and reinstallation Allied · Furnace
- High altitude installation Allied · Furnace
- Horizontal clearance figure (values not readable) Allied · Furnace
- Install condensate trap and drain Allied · Furnace
- Install sidewall vent termination Allied · Furnace
- Installation code requirements Allied · Furnace
- Intake piping for direct vent installations Allied · Furnace
- Intake piping for non-direct vent installations (air from indoors) Allied · Furnace
- Joint cementing procedure for plastic vent pipe Allied · Furnace
- Keep the furnace away from contaminated combustion air Allied · Furnace
- Let solvent fumes clear before startup Allied · Furnace
- Limits and switches that are factory set Allied · Furnace
- LP/propane leak detector Allied · Furnace
- Massachusetts carbon monoxide detector and venting requirements Allied · Furnace
- Measuring manifold gas pressure Allied · Furnace
- Measuring supply gas pressure Allied · Furnace
- Platform installation of a horizontal unit Allied · Furnace
- Preventing exhaust icing in extreme cold Allied · Furnace
- Priming the condensate trap Allied · Furnace
- Protecting walls from acidic flue gas Allied · Furnace
- PVC versus ABS connections at the furnace Allied · Furnace
- Remove bottom panel for horizontal or bottom return installs Allied · Furnace
- Remove the bottom panel for bottom or side return Allied · Furnace
- Remove the shipping bolt on 1/2 HP blower units Allied · Furnace
- Replacing a furnace that shared a common vent Allied · Furnace
- Return air connection and sealing Allied · Furnace
- Return air must not come from a room with a gas appliance Allied · Furnace
- Sizing intake and exhaust vent pipe Allied · Furnace
- Start-up and performance check list Allied · Furnace
- Suspended or platform install of horizontal furnace Allied · Furnace
- Thermostat heat anticipator setting Allied · Furnace
- Turning off gas to the unit Allied · Furnace
- Unit fails to operate Allied · Furnace
- Upflow 5-ton units with 1800 cfm or more airflow Allied · Furnace
- Venting configuration (direct vent or non-direct vent) Allied · Furnace
- Watchguard automatic reset after ignition lockout Allied · Furnace
- Winterize and clean the condensate trap Allied · Furnace
Source: Allied 506724-01 (Issue 1108) A95UH/A93UH/95G1UH/92G1UH Installation Instructions, Diagnostic Codes p.53. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.