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Lennox kha036 What is the most likely cause of an Anti-short cycle lockout

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Amana Air Command 90 furnace LED light blinks 3 times pause 3 times


TRI-COLOR (DSI LED) DIAGNOSTIC TABLE
No. of Red BLINKS
1 Flame sensed when no flame should be present
Verify the gas valve is operating and shutting down properly. Flame in burner assemble should extinguish promptly at the end of the cycle. Check orifices and gas pressure.

2 BLINKS Pressure switch stuck closed/ inducer error
Pressure switch stuck closed. Check switch function, verify inducer is turning off.

3 BLINKS 1st-stage pressure switch stuck open/inducer error
Check pressure switch function and tubing. Verify inducer is turning on the pulling sufficient vacuum to engage switch.

4 BLINKS Open limit switch Verify continuity through rollout switch circuit.

5 BLINKS Open rollout/open fuse detect Verify continuity through rollout switch circuit, check fuse.

6 BLINKS 1st-stage pressure switch cycle lockout If the first stage pressure switch cycles 5 times (open, closed) during one call for heat from the thermostat the control will lockout.Check pressure switch for fluttering, inconsistent closure or poor vacuum pressure.
7 BLINKS External lockout (retries exceeded) Failure to sense flame is often caused by carbon deposits on the
flame sensor, a disconnected or shorted flame sensor lead or a
poorly grounded furnace. Carbon deposits can be cleaned with
emery cloth. Verify sensor is not contacting the burner and is locatedin a good position to sense flame. Check sensor lead for shortingand verify furnace is grounded properly.

8 BLINKS External lockout (ignition recycles
exceeded where flame is established and then lost)Check items for exceeded retries listed above and verify valve is not dropping out allowing flame to be established and then lost.

9 BLINKS Grounding or Reversed polarity Verify the control and furnace are properly grounded. Check and reverse polarity (primary) if incorrect.

10 BLINKS Module gas valve contacts energized
with no call for heat Verify valve is not receiving voltage from a short. If a valve wiring is correct and condition persists, replace module.
11 BLINKS Limit switch open - possible blower
failure overheating limit Possible blower failure, restricted air flow through appliance or duct work. Verify continuity through limit switch circuit and correct overheating cause.

12 BLINKS Module Ignitor contact failure Fault code indicates the module ignitor contacts are not functioning
properly. Replace module.Solid Module - internal fault condition Module contacts for gas valve not operating or processor fault.
Reset control. if condition persists replace module.
3 double 2nd-stage Pressure Switch Stuck Open/Inducer Error
Check pressure switch function and tubing. Verify inducer.

Nov 11, 2013 | Patton Electric Patton PUH680-U Electric...

2 Answers

Lennox pulse 21 startup issues .does not engage fan and complete heat cycle every time .


Have seen a rash of faulty blower time delays in lennox equipment. Lennox has a recall on one currently, not sure if your system is effected but it can be bypassed if in fact the problem.

Aug 23, 2017 | Heating & Cooling

1 Answer

Turned my furnace off while going away on vacation. When I came back, the furnace would not turn back on. Lockout light is blinking.


with some thermostats you must cycle the power after a lockout relay energizes, so turn the stat off and back on and then check operations to see what caused it to lockout, often the lockouts are on low and hi pressure safeties, so you may have a refrigerant charge problem

Jul 12, 2011 | Heating & Cooling

1 Answer

Lennox Model G12Q3-82-1 Gas Furnace pilot light extinguishes each time butrner cycles off afrer heat cycle


Hello,See if it is blowing out.Relite the pilot and run the fan(blower) with out the main burner running.A cracked heat extanger will be the cause if it blows out.

Oct 29, 2010 | Heating & Cooling

1 Answer

Hi, I have a question about anti-short cycle, can anyone explain what exactly 'anti-short cycle' is? If I am running the air conditioner's compressor with a soft-starter (1-phase and 3-phase), does...


Anti-Short-Cycle Timers - Airotronics

www.airotronics.com/products-antishortcycle.phpAnti-short-cycle timer prevents premature cycling of compressors in refrigeration, air conditioning and heat pumps, thereby reducing nuisance tripping of fuse or circuit breaker.

Feb 14, 2018 | York / Cam-stat Anti-short Cycle Timer...

1 Answer

1987 camaro z28 anti-theft lockout


1st I would check the battery if it had been setting while the go from there

May 07, 2009 | 1987 Chevrolet Camaro

1 Answer

Gas furnace short cycling. checked by experts no solution


This is tough one. If you have an older mercury type thermostat, behind the cover theirs a small copper pointer that points to some numbers. This is your heat anticapator. This setting has to match your milliamp draw of all the controls on your furnace. If set to low it over heats and fools the thermostat into thinking its satisfied. Move the point to a higher setting in little increments. Hope this works for you. Can't help with the vibration without hearing it.

Mar 03, 2009 | DCS Large Appliances Built-In Ovens...

1 Answer

Lennox Furnace


Make sure to check and see if you do not have any bare wires touch ground or if you have any wires pinched causing a short to ground. Safety first so turn of power before checking. Also check to see if any wires on unit are touching one another. Hope this helps you.

Feb 15, 2009 | Heating & Cooling

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