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Phone: 866/280-6229 or 831/422-9693
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We're happy to provide free Zon gun troubleshooting guidance over the phone, but before calling, please consider some very common and easy to remedy propane cannon problems: Zon cannon logo
Never perform any maintenance or troubleshooting with the gas tank attached to the propane cannon.

Descriptions, pictures, and tips below are for the Zon Mark 4 cannon but generally also apply to the Zon Mark 2 cannon.

1) Wind.
If you're operating the cannon in a windy area, it's possible the wind is too strong and is disturbing the gas mixture (blowing the gas away before it ignites). This is often the case when the cannon appears to be working, but the blasts are dull or just a clicking sound is heard as the tripper strikes the lighter. The solution is to place the cannon out of the wind or behind a wind screen, or discontinue use until wind subsides.

2) Moisture.
If your weather has been especially humid or foggy (not regular morning dew, but permeating dampness), moisture may have accumulated inside the propane cannon. This can be determined by lifting the lid and looking inside for signs of excess moisture, primarily in the area of the lighter/piezo element. The solution is to dry off any moisture.

Zon propane cannon
3) Cobweb.
When it's time to take your Zon Cannon out of storage for another season's use, be aware of spiderwebs/cobwebs which can clog the gas intake chamber. Usually, this is evident when the cannon was firing regularly before storage, and found to be non-working upon removal. Yes, this seems unlikely, but we've found it is very often the cause of this type of trouble. Removing the clog is simple.
To access the clog, you'll need to detach the main body mechanism from the megaphone by gently bending it away from the bolts.
Below: Whitish substance is cobweb clog.
Zon propane cannon
At right: Cobwebs can be quite sticky, but removal is easy with a twisted wire brush or similar tool.
Zon propane cannon
Zon Cannon barrel
4) Material inside of barrel.
Another problem that often arises after the propane cannon has been stored during the off-season is material within the barrel. Be sure to clean out any debris that has accumulated within the barrel; further examine the depths of the barrel by shining a light into it; if you are unable to see clear through to the Lighter #91506, there is likely material clogging this area. Note the Iris #91146 opening is almost 2-inches, which is plenty of room for a rodent or other small critter to set-up residence while the cannon is not in use (we have "repaired" many cannons by removing mouse and wasp nests in the area beyond the Iris). Storing your cannon in a sealed plastic bag can help lessen the likelihood of rodents or insects nesting within the propane cannon.

Always remember to examine your propane cannon before using after a period of storage.

5) General gas issues.
The propane tank must be securely connected to the Regulator. If there is pressurized gas supply to the cannon, it will go through its cycle. If the tank is filled with gas, is hooked up properly, and is turned on, action will happen at the cannon (will blast as it should, or will generate mechanical/clicking noises if there's a problem within the cannon).
If nothing happens:
  1. Tank is empty or very near empty. If refilling the tank doesn't help, try a different tank.
  2. Regulator is not fully tightened or seated.
  3. Overflow protection device has not been deactivated (so gas cannot reach the cannon).
  4. Can you smell gas? It may be leaking through the Hose #6556 or Diaphragm #91316.
  5. Has aftermarket hose been installed recently? The type of hose required for the Zon cannon is very specific and you're not likely to find an acceptable aftermarket substitute, even when purchased from a propane retailer. Zon Hose #6556 is quite inexpensive (less than $3 per foot) and readily available from Sutton Ag or your local Zon gun dealer.
  6. Have any parts been manipulated? The propane cannon is very user serviceable, but the parts are not meant to be altered in any way (ie: enlarging holes to manipulate gas flow, etc.). To do so will void the warranty, can cause more costly repairs, and can be dangerous.
General Zon Mark 4 Propane Cannon Troubleshooting
Failure Cause Remedy
The Zon Mark 4 Cannon, fully connected, fails to operate at all. Gas tank valve is not open. Open valve.
Interval regulator is not open. Open regulator by turning knob towards the "+" (plus) mark; if blasts are too frequent, turn knob towards the "–" (minus) mark.
Gas tank is empty or has too little pressure. Connect new gas tank.
Gas valve #91406 cannot be opened. This may happen if the device has not been operated for some time. Using 2 fingers to grasp the hinged clip #91266, pull it up vertically once or twice. Be sure to keep the hinged clip from slipping over the stop lip of the spring holder #91236 as this will prevent you from opening the gas valve.
Leaks Coupling nut gas regulator is not tight enough. Tighten coupling nut with suitable spanner.
Hose connecting gegulator unit to cannon has been damaged. Replace the hose. A quick method to trace a leak in the gas regulator is to check it with a leakage spray.
Diaphragm leaks along the plate rim. Repair should be carried out by the dealer.
The Zon Mark 4 Cannon operates, but there is no explosion or sound. Ignition gives a weak spark or no spark at all. Examine Electrode #91536 / 91536S. It is possible that the porcelain or the mass point is broken; if so, replace.

Replace Piezo-Element #91526.

Piezo-Element/Electrode are wet. Dry both well.

Wind is too strong (greater than 15 mph); gas/air mixture is disturbed. Place the cannon out of the wind, or behind a wind-screen.
Gas mixture is not good. Gas mixture in tank is not good, replace gas tank.
The Zon Mark 4 Cannon works, but Diaphragm Gland #91226 remains in the top position. Gas Valve Holder #91416 is blocked or partially blocked. Clean opening with small piece of wire no more than .6 mm thick.
Gas Valve #91406 cannot be opened. This may happen if the device has not been operated for some time. Using 2 fingers to grasp the hinged clip #91266, pull it up vertically once or twice. Be sure to keep the hinged clip from slipping over the stop lip of the spring holder #91236 as this will prevent you from opening the gas valve.
Gas Valve #91406 stays open: Diaphragm Gland #91226 remains above. Diaphragm Springs #91286A are broken. If so, replace.
Gas Valve #91406 cannot be opened or sufficiently opened. Lifting level must be 1 - 2 mm. Repair should be carried out by the dealer.
The Zon Mark 4 Cannon operates, but gives dull explosions. Wind is too strong; gas/air mixture is disturbed. Place the cannon down wind, out of the wind or behind a wind screen.
Telescopic megaphone not extended, or only partially extended. Pull out to full extension.

If you'd like to order cannon parts or need help troubleshooting your propane cannon issues, please call us toll-free at 866/280-6229

Zon gun troubleshootingScrew, M6x30ScrewNutRear CoverNutNutIris CoverScrew, M6x30Outer MegaphoneInner MegaphoneClamping BoltHose ClampHoseNutPressure RegulatorPrecise RegulatorHolderHose ClampDiaphragm HolderDiaphragmO-RingCoverHandleLighter, Complete (igniter)ElectrodeFrameScrew, M4x20Piezo-ElementNutPull SpringPull SpringPull RodPull RodDiaphragm SpringDiaphragm SpringDiaphragm SpringO-RingRight Base Frame (leg)Wing NutPull SpringPull-Spring PinO-RingShaftHousingHinged ClipHinged BlockCapWing NutLeft Base Frame (leg)Main BodyScrew, M6x10Joint PinDiaphragm Gland (lever)Spring HolderJoint PinScrew, M6x10TripperO-RingSpringOuter megaphoneWeb-clogged gas intake chamberZon mechanismWeb-clogged gas intake chamberOuter megaphoneUnclogged gas intake chamberCobweb removed from cannonTwisted wire brushOuter megaphoneCobweb removed from cannonTwisted wire brushUnclogged gas intake chamber