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Troubleshooting FAQ

Occasionally customers will encounter technical issues regarding Shrinkfast heat tools. Therefore, we have documented the more common support questions involving the models 998 and 975. If you still experience difficulties, or are uncomfortable attempting any of these procedures, please contact your local distributor or Shrinkfast Marketing direct at 603.863.7719 or email at info@shrinkfast-998.com.

Problem

Cause

Solution

Tool will not Fire

Trigger not depressed fully

Depress trigger all the way until igniter fires with a click

 

Trigger activated too quickly

Squeeze trigger slowly to make sure mixture has entered combustor before firing.

 

Pressure too low

Check regulator and make sure the PSI reading is at least 15. Anything below 15 PSI will damage the heat gun

 

Trigger not fully released

Release both the safety and the trigger to make sure the igniter is reset

 

Spark plug gap to small/big

Open the spark plug gap to 3mm (about the same thickness as a nickel).

 

Defective igniter or connections

Disconnect from fuel source and check for a spark or return for service

 

No click from trigger

Replace trigger. It is a good idea at this time to replace all o-rings.

 

Gas timing screw needs adjustment

With the gas on, turn the #16 screw clockwise until the gas begins to flow. Then back off the screw until the gas stops even when light pressure is exerted on the trigger without actuating the safety. (This suggestion is recommended for authorized service technicians only).

Problem

Cause

Solution

Combustor turns red (insufficient air flow).

Under normal conditions the inner tip of the combustor will turn red. However, if more then 1” of the combustor turns red, then trouble is indicated.

The outer shell of the combustor should not turn red.

Wrong fuel

Make sure you have a vapor withdrawal propane tank (similar to a BBQ grill tank).

Do not use liquid propane tanks (similar to fork truck tanks). Propane and natural gas are the only approved fuels for use with the heat tools.

 

Tank has ice build up or the tank pressure is below 15 PSI

Propane is low so change the tank. Change tank to allow iced tank to thaw.

 

Excess flow check valve not open

Open tank valve and wait 10 to 30 seconds. You should hear a faint click in the POL when ready. This allows the hose to pressurize properly before using the heat tool.

 

Clogged orifice or filter

Remove items and clean with compressed air or replace.

 

Clogged hose

Blow out with air or replace

 

Clogged fuel line

Blow out or replace

Problem

Cause

Solution

Large flame (fuel flow)

Leak in orifice assembly

Tighten orifice in holder or replace.

 

Wrong pressure

Make sure pressure gauge is between 15-30 PSI (factory preset to 22 PSI).

 

Clog

Clear the hose, fuel line, valve and filter of debris.

 

Worn o-rings

Replace all o-rings.

Problem

Cause

Solution

Tool shuts off after short burst of ignition

Excess flow check valve not open

Open tank valve and wait 10 to 30 seconds. You should hear a faint click on the POL when ready. This allows the hose to pressurize properly before using the heat tool.

Problem

Cause

Solution

When the trigger is released the tool continues to fire or gas continues to leak.

Worn valve

998- replace valve

975- replace or rebuild valve