Try these troubleshooting techniques. For further assistance, visit the HWS parts and repair page of the website.
Sight Will Not Hold Zero
- Make sure the sight is mounted so the cross bolt engages the front muzzle of the rail slot.
- Recoil will naturally force the sight forward, but mounting in the forward position eliminates this.
- Do not over-tighten the mount bolt. The specification is 18 inch-lbs., which is approximately hand-tight, using a coin.
- EOTech’s sights experience a point of impact shift away from the point of aim when the sight is exposed to a temperature different from the temperature at which the sight was zeroed. After zeroing the sight at or near ambient temperature (73°F), the zero position will shift during operating temperature changes. The sight has the potential to shift approximately +/- 5 Minutes of Angle (“MOA”) at -40°F and 122°F. Due to thermal drift, the sight may not return to zero. The sights have the potential of approximately a +/- 2 MOA zero shift upon return to ambient (73°F) after being exposed to any temperature between -40°F and 122°F. To achieve optimum accuracy, the sight zero should be verified whenever the sight is exposed to marked temperature changes, and the sight should be re-zeroed as necessary. For more information on this issue, please click here.
Mechanically Zeroing a Sight
This exercise is identical to setting up any scope on a firearm. Mount the HWS securely on the rail. Then use the windage and elevation adjustments on the sight to zero the optic at a specific range.
Each click or adjustment of the sight moves the reticle approx. 0.5 MOA. The sight has...
- 40 MOA of travel in every direction from center
- A complete range of 80 MOA (160 clicks) from the extreme left adjustment to the extreme right adjustment
- A complete range of elevation adjustment of 80 MOA (160 clicks) from top to bottom
To re-zero the sight...
- Adjust the reticle to one end of the extreme (left or right).
- You will feel a sudden resistance and a limitation in your ability to move the shaft once you reach the extreme.
- Do not attempt to adjust the shaft in the same direction. That would result in seizure of the windage or elevation shafts and cause the sight to be inoperable.
- Once at that extreme, turn the shaft 80 clicks in the opposite direction. That will move the reticle 40 MOA, back to center.
- Repeat the process for the elevation (top to bottom).
- The sight is now re-zeroed.
Battery Life is Not As Expected
The battery life will vary by model and battery type (assuming nominal brightness setting at room temp).
- Models with 2 batteries run for over 1,000 hours.
- Models with 1 CR battery have a run time of about 600 hours.
Sight Will Not Power Up
- Ensure that the batteries are properly inserted according to the diagram on the bottom of the battery cap.
- Replace the batteries with new, unused, fully charged batteries.
- Inspect the battery contact points in the battery cap and on the sight.
- These contact points are spring-loaded and are surrounded by a rubber gasket that may catch the spring.
- Move the contact points around and ensure they are at or above the surface of the rubber gasket.
- Verify that the contacts are both silver in color and are free of any oxidation.
- Contact EOTech for repair and service. See the HWS parts and repair page for instructions.
Reticle Flashes, or Flashes On and Off, or Unit Turns Off During Recoil
This is the low-battery indicator.
- Replace the batteries, following these instructions:
- Use the correct batteries. For an N cell sight, make sure to install only 1.5-volt N cell E90 batteries. Often A23 12-volt batteries are substituted in error, and will damage the electronics.
- Use quality, name-brand batteries. These have proven to be the most effective in withstanding a consistent amount of recoil. Many brands of batteries deteriorate more quickly than quality name brands, and can result in failures. Under heavy recoil, inexpensive batteries can bulge and the positive terminal can indent.
- Inspect the contacts on the sight body.
- For models OTHER than XPS and EXPS, the contacts must both be silver in color.
- If one contact is dark, or if contacts appear anything other than bright silver, there is oxidation due to battery leakage. Follow the instructions on the HWS parts and repair page to contact EOTech for repair and service.
Streak in Reticle, Reticle is Dim, or Reticle Fades in Parts of the Window
- Replace the batteries.
- Check with others who have used the sight and compare what you see, to ensure the issue is not with your focal acuity.
- Visit the HWS parts and repair page of the website for factory repair instructions.
- Reticle fade as a result of moisture incursion may affect sights manufactured before August 2014. Even for sights manufactured before that date, the effect may not be substantial. The issue is that atmospheric moisture conditions can lead to the HWS’s reticle fading or eventually disappearing. It typically is noticeable first when the reticle appears to dim at the edges of the sight window. The sight’s age and environmental exposure are factors that accelerate reticle dimming. In many cases, however, this condition can be mitigated by increasing the brightness of the reticle, using the sight’s brightness controls. For more information on this issue, please click here.
Reticle Appears Fuzzy
What you are seeing may be normal. The reticle circle people usually see online or in print advertisements is a graphic representation of a reticle. The reticle is naturally pixelated and the outer circle should appear to be made up of many small dots. The center circle should be distinguishable as one dot.
Reticle Has a Halo Effect or More Than 1 Reticle is Visible
- Lower the brightness level of the reticle. The fault is generally caused by the reticle brightness being too high. The reticle is designed to not be so bright as to block the target.
- The reticle is optically projected onto the target plane. Focus on it as you would any other object at that distance. Do not focus on the sight housing, as with other reflex sights, but focus on the target. The outer ring is designed to be a reference to center, similar to a ghost ring.
- If you wear corrective lenses for nearsightedness, you will require them to see the reticle in focus. This is because the reticle is projected onto the target plane. If you wear bifocals or have astigmatism, you may see a distorted reticle.
- Check with others who have used the sight and compare what you see, to ensure the issue is not with your focal acuity. Do this prior to sending the sight for repair.
- Follow the instructions on the HWS parts and repair page to contact EOTech for repair and service.
Center Dot of HWS is Not Round
Not everyone sees the center dot as a circle, or sphere. If the dot of your HWS does not appear perfectly round, the distortion may be caused by the way your eye perceives the dot, rather than by some mechanical defect.
Because of differences in the lenses of peoples’ eyes and in environmental conditions, round objects that subtend areas near 3 minutes of angle may appear distorted in a variety of ways.
Some may perceive the center dot to be like the hub of a bicycle wheel with spokes. If you see this in your sight, look closely at the dot and rotate the sight. If the spokes do not move, then the appearance of the reticle is how your eye perceives the dot. Dimming the sight may eliminate the distortion.
If you notice the issue only in cold temperatures, the sight may be affected by cold weather distortion. Cold weather distortion generally does not affect EOTech-branded HWS manufactured after March 2008. The historical issue with cold weather distortion was that the HWS’s aiming dot experienced distortion of size and shape when the sight was exposed to temperatures below 32° F. This became worse as the temperature approached -40° F. It had virtually no effect in warmer temperatures or at the close-quarter ranges where the HWS is typically used, because at those closer distances the distortion would not have a significant effect on the point of impact. Although generally unnoticeable to the naked eye, the distortion existed at colder temperatures. For more information on cold weather distortion, please click here.
Want a Different Reticle Image in Sight
Changing the image is not feasible because it would require complete housing replacement. Doing so is more expensive than purchasing a new sight.
With the purchase of a new sight, however, you receive the latest technology revision level and a new 2-year warranty.
Voiding Warranty By Using GG&G Flip Covers and Accucam
Use of the GG&G Flip Covers and Accucam voids only a portion of the EOTech HWS warranty. Parts of the sight that interface with the Accucam or lens covers will not be covered by EOTech warranty: hood screws, hood, base, locking bar, or any portion of the weapon with which those parts of the sight interface. However, the electronic, optical, and mechanical function and portions of the sight will still be covered.
Bolt is Missing, Bolt is Broken, or Latch is Broken
Visit the HWS parts and repair page for instructions.