LG ADQ73613401 water filter

If your fridge is one of the models below, the water filter you need is the ADQ73613401 (LT800P).

LG InstaView and American style GSX and GSJ ranges sold in the UK.

Specification

Manufacturer part number	ADQ73613401 (LT800P)
Equivalent codes	LT800PC, ADQ73613402, ADQ73613408
Fitting position	Internal cartridge in the upper interior of the fridge compartment
Capacity	Approximately 757 litres (200 gallons) per cartridge
Recommended change interval	Every 6 months
NSF certification	NSF 42 certified per LG's published filter specification; check the box for NSF 53 status on your specific pack

What does not fit

Older LG cartridges such as the LT700P and LT1000P are different physical parts made for other fridge generations; do not assume they interchange without checking your fridge's own filter compartment shape.

How to replace it

Locate the filter compartment described above and turn off the fridge's water supply if your model has a shut off valve.
Turn the old cartridge a quarter turn in the direction marked on the housing, or press the release catch, then pull it straight out.
Check the reference printed on the old cartridge against ADQ73613401 (LT800P) before fitting the replacement, since two cartridges from the same brand can look alike but not seal the same way.
Remove the protective cap from the new cartridge, then push it into the housing and turn it a quarter turn until it locks.
Run 2 to 3 litres of water through the dispenser before drinking it, since new cartridges release carbon dust on their first use.
Reset the fridge's filter indicator, usually a button held for a few seconds, so it counts down correctly to the next change.

Common mistakes

Buying by fridge brand alone instead of checking the exact part number, which on a brand with more than one system leads to a cartridge that does not fit.
Leaving the filter well past its change interval, which reduces flow rate and can let the carbon block become a place for bacteria to grow rather than filter them out.
Forcing a cartridge that does not turn or push in without resistance; if it does not seat cleanly, it is very likely the wrong reference.

How this reference sits in the LG range

ADQ73613401 (LT800P) is the only reference published for LG on this site, because it is the only one confirmed against a manufacturer or distributor source. If your fridge does not match the fitment described above, see our guide for an unlisted model rather than guessing.

Where this information comes from

The specification above is taken from LG UK official site (lg.com/uk) product page for the ADQ73613401 water filter, cross checked against waterfilterman.co.uk and aqualogis.co.uk UK retailer listings. References are re-checked when a manufacturer renumbers a pack; if you find a discrepancy with your own fridge, tell us and the page is corrected.

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Tools, space, and preparation before you start

You should not need a special tool for the LG ADQ73613401, but the job is cleaner if you prepare the area first. Allow about 10 minutes for the cartridge change and another 3 to 5 minutes for flushing water through the dispenser. If the fridge is built into a tight kitchen run, open both doors fully and remove any tall items from the upper shelf area before you touch the filter head.

Use a dry towel under the filter housing to catch drips from the old cartridge.
Have a jug or bowl with at least 3 litres of capacity ready for flushing, or use a 1 litre jug filled 3 times.
Keep the new cartridge cap in place until the moment you fit it, so the sealing end stays clean.
Do not use pliers on the cartridge body. Hand force should be enough if the correct filter is aligned properly.
If the fridge has just been moved, leave it stable and level before changing the filter, because a twisted cabinet can make doors and internal covers bind.

The useful working space is not large, but your hand needs room to push the cartridge straight into the head. As a practical guide, keep at least 150 mm of clear space below and in front of the housing so you can support the filter body without angling it. If a shelf blocks your hand, remove the shelf rather than fitting the cartridge at an angle.

Detailed fitting checks during the replacement

Before removal, look at the old cartridge and note its final locked position. Many fitting problems come from starting the new cartridge in the wrong rotational position. Use the printed mark, the grip shape, or the label orientation as a reference, but do not rely on the label alone because labels can be applied slightly off centre.

When the old cartridge is released, pull it out on the same line as the filter head. A small amount of water may run out. This is normal. If water continues to run for more than a few seconds, stop and check that the dispenser has not been pressed and that any local shut off valve is closed. Wipe the filter head before inserting the new cartridge, because grit on the sealing face can cause a slow leak.

Fit the new cartridge with steady hand pressure. You should feel the nose enter the head before you turn or lock it. If it stops hard after only a few millimetres, remove it and inspect the protective cap area, the old filter reference, and the shape of the end. Forcing the part can damage the filter head, which is more expensive than the cartridge.

Check point	Useful figure	What it means
Time to remove and fit	About 5 to 10 minutes	Longer usually means alignment or access is wrong.
Initial flush volume	2 to 3 litres	This clears loose carbon fines before drinking the water.
Leak check after fitting	First 10 minutes, then again after 1 hour	Slow drips may not show immediately.
Dispenser purge pattern	Short fills of 10 to 20 seconds	This reduces splashing and helps move trapped air.
Standing time if air is noisy	5 minutes	Air pockets can settle before a second purge.

Common faults after fitting and how to recover

If the water looks grey for the first few fills, discard it and continue flushing in short batches. Fine carbon dust is common after a cartridge change. If the water stays cloudy but clears from the bottom upward in a glass, the cause is usually air, not dirt. Run another litre, wait 5 minutes, and test again.

If flow is weak immediately after fitting, check that the cartridge is fully locked and that the water supply has been reopened where a valve is fitted. A partly seated cartridge can restrict flow without leaking. Remove it, refit it squarely, and listen for the final lock. If the dispenser spurts, pulses, or knocks, purge in 10 to 20 second runs until the sound reduces.

If there is a drip at the filter head, remove the cartridge and dry the area completely. Refit it once, using straight pressure and the correct turn. Do not wrap tape around the cartridge end and do not add grease unless the fridge manufacturer specifically instructs it for your model. If the same drip returns with the old cartridge and the new cartridge, the problem may be the fridge filter head rather than the cartridge.

If the filter indicator does not reset, close the door and try again with a firm button hold for several seconds. Some control panels ignore a reset while the dispenser is active or while a door alarm is showing. For broader filter questions, see the FAQ.

Special cases worth checking

For rented homes or shared kitchens, write the fitting date on a removable label inside the fridge, not on the outside door. Use a simple date such as month and year. This avoids guessing when the next 6 month service point arrives.

If the fridge has been unused for several weeks, flush more than the normal first jug before drinking the water. A practical approach is to discard 3 litres after the cartridge change, then discard another 1 litre after the fridge has chilled and the dispenser has stood for a short period.

If your existing cartridge has no readable label, do not identify it by colour or by the LG badge alone. Compare the compartment shape, the locking method, and the old cartridge end against the information on this page. LG has used more than one internal cartridge design, and parts from other LG ranges are not safe assumptions. If you are still identifying the family of filters, start from the LG range page at LG.

If the fridge is connected to a reverse osmosis system or another pre filtration system, check the fridge manual for pressure requirements before blaming the cartridge for slow water. Extra filtration can lower pressure, and the fridge dispenser may then fill slowly even with a new internal filter fitted correctly.