{"id":3506,"date":"2024-12-30T15:51:37","date_gmt":"2024-12-30T15:51:37","guid":{"rendered":"https:\/\/www.priorclave.com\/en-us\/?p=3506"},"modified":"2026-04-06T18:30:29","modified_gmt":"2026-04-06T18:30:29","slug":"troubleshooting-the-f004-error-code-low-water-even-when-you-think-you-have-plenty","status":"publish","type":"post","link":"https:\/\/www.priorclave.com\/en-us\/2024\/12\/30\/troubleshooting-the-f004-error-code-low-water-even-when-you-think-you-have-plenty\/","title":{"rendered":"Troubleshooting the F004 Error Code: \u201cLow Water\u201d (Even When You Think You Have Plenty)"},"content":{"rendered":"<p>Like the \u201cCHECK ENGINE\u201d and \u201cMAINTENANCE\u201d lights on your car dashboard, your Priorclave has a set of \u201chidden until lit\u201d warning lights to tell you when something is amiss. These are on the black strip below the temperature and time displays on the front panel (labeled\u00a0 12 in the diagram below). When one of these warning lights comes on, the autoclave will also display an error code in the red temperature readout (labeled 6 in the diagram).<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-3507 size-full\" src=\"https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2024\/12\/PNA-panel-diagram.png\" alt=\"The front panel of a Priorclave autoclave\" width=\"512\" height=\"356\" srcset=\"https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2024\/12\/PNA-panel-diagram.png 512w, https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2024\/12\/PNA-panel-diagram-300x209.png 300w, https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2024\/12\/PNA-panel-diagram-64x45.png 64w, https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2024\/12\/PNA-panel-diagram-128x89.png 128w, https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2024\/12\/PNA-panel-diagram-240x167.png 240w, https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2024\/12\/PNA-panel-diagram-320x223.png 320w, https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2024\/12\/PNA-panel-diagram-360x250.png 360w, https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2024\/12\/PNA-panel-diagram-375x261.png 375w, https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2024\/12\/PNA-panel-diagram-480x334.png 480w\" sizes=\"auto, (max-width: 512px) 100vw, 512px\" \/><\/p>\n<p>Fortunately, service calls for most users are few and far between. Many issues can be easily remedied by the end user, sometimes with a little remote guidance from our support team. The online <a href=\"https:\/\/www.priorclave.com\/en-us\/support\/faq\/\">FAQ<\/a>, <a href=\"https:\/\/www.priorclave.com\/en-gb\/wp-content\/uploads\/sites\/2\/2019\/07\/Fault-Indicators-and-Codes-UK.pdf\">Warning Lights and Fault Codes<\/a> documentation, and the manual that came with your autoclave are extremely helpful in these situations (especially the \u201cWarning Indicators and Fault Codes\u201d and \u201cTroubleshooting\u201d sections of your manual).<\/p>\n<p>The \u201cF004 error code\u201d is, far and away, the most common error users get\u2014and also the most easily remedied.<\/p>\n<h2>What is the F004 error code?<\/h2>\n<p>On every model of Priorclave autoclave, the <b>F004 error code<\/b> means \u201c<b>Low Water<\/b>.\u201d Either the autoclave cannot detect water in the reservoir at the bottom of the chamber, or there isn\u2019t quite enough water in the reservoir for the autoclave to generate steam.<\/p>\n<p>The \u201c<b>F004<\/b>\u201d code will appear in red in the temperature display (display 6 in the diagram above). The words <b>WATER<\/b> and <b>FAULT<\/b> will pop up in the hidden-until-lit readout (the black strip labeled 12 in the diagram).<\/p>\n<h2>What Do I Do About the F004 Error Code?<\/h2>\n<p>First, check the water level. If this error pops up mid-cycle, you\u2019ll need to wait for the autoclave to cool for the door to unlock. Remember that this load is not reliably sterile, and will need to be run again.<\/p>\n<p>The water in the chamber should just about reach the top of the reservoir. If you have an autofill autoclave, the reservoir should automatically begin filling when you open the door. In many cases, the cause of an F004 error code on autofill autoclaves is loading and closing the autoclave too quickly, thus preventing the reservoir from filling all the way. Like a top-loading clothes washing machine, it\u2019s best to let the autoclave fill with the door open until the water cuts off automatically.<\/p>\n<p>On manual-fill autoclaves, you can top off the reservoir with fresh tap water yourself (provided you don\u2019t have <a href=\"https:\/\/www.priorclave.com\/en-us\/2024\/04\/21\/what-water-is-best-for-my-autoclave\/\">hard water issues<\/a>; if so, a jug of grocery store bottled water is fine). Fill it to within about 1cm of the lower shelf.<\/p>\n<p>Once you\u2019ve corrected the issue, you\u2019ll be able to cancel the error message. If your model has a setting lock key switch, turn it to the \u201cenable position\u201d (position 3) to reset the warning. If your model doesn\u2019t have a key switch, you can just press the reset button.<\/p>\n<p>Still having problems? Don\u2019t hesitate to<a href=\"https:\/\/www.priorclave.com\/en-us\/contact-us\/\"> contact us<\/a> for a helping hand.<\/p>\n<h2>What if I Get F004 Error Code Even Though Water is at Correct Level?<\/h2>\n<p>If you get a F004 error code even though water is at correct level, it usually means you have dirty probes. The probes (shown below) are part of the water sensing mechanism, ensuring that there is enough water in the autoclave chamber to generate steam for the sterilization cycle.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3266\" src=\"https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2022\/10\/PNA-probes-diagram.png\" alt=\"diagram of standard steam autoclave water sensing probes\" width=\"500\" height=\"297\" srcset=\"https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2022\/10\/PNA-probes-diagram.png 1006w, https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2022\/10\/PNA-probes-diagram-300x178.png 300w, https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2022\/10\/PNA-probes-diagram-768x457.png 768w, https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2022\/10\/PNA-probes-diagram-64x38.png 64w, https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2022\/10\/PNA-probes-diagram-128x76.png 128w, https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2022\/10\/PNA-probes-diagram-240x143.png 240w, https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2022\/10\/PNA-probes-diagram-320x190.png 320w, https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2022\/10\/PNA-probes-diagram-360x214.png 360w, https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2022\/10\/PNA-probes-diagram-375x223.png 375w, https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2022\/10\/PNA-probes-diagram-480x285.png 480w, https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2022\/10\/PNA-probes-diagram-540x321.png 540w, https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2022\/10\/PNA-probes-diagram-640x380.png 640w, https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2022\/10\/PNA-probes-diagram-720x428.png 720w, https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2022\/10\/PNA-probes-diagram-800x476.png 800w, https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2022\/10\/PNA-probes-diagram-960x571.png 960w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Gunk tends to accumulate on these probes, preventing them from sensing the water level. Regular cleaning prevents this: Empty the reservoir, wipe down the probes, wipe down the chamber interior, and refill the reservoir. If you use your autoclave less than once each week, you should still do this at least twice each month. Minerals naturally present in your water will tend to accumulate on the metal of the probe and chamber, even if the machine is idle.<\/p>\n<p>Use a soft sponge or towel; no aggressive scrubbing needed. If you\u2019ve had a spill or burst container in the autoclave, you may need to use a little mild dish soap.\u00a0There\u2019s never a need for harsh cleaners or steel wool in your Priorclave! (We only say this because people have done it, and been unhappy with the outcome.) If you find that <a href=\"https:\/\/www.goodhousekeeping.com\/uk\/house-and-home\/household-advice\/a656992\/remove-limescale-stains\/\">scale<\/a> is building up in the chamber or on the probes, then use some vinegar or CLR from the hardware store. Thoroughly rinse the chamber and probes with fresh clean water once you\u2019re done.<\/p>\n<p>Finally, some users get chronic F004 errors because of changes in their water quality. You can learn more about this in our<a href=\"https:\/\/www.priorclave.com\/en-us\/wp-content\/uploads\/sites\/3\/2019\/06\/Priorclave-Water-Quality-Requirements.pdf\"> Water Quality document<\/a>, or just give us a call to discuss your options.<\/p>\n<p>In rare cases, the issue is that the water sensor electronics have been damaged somehow.<\/p>\n<h2>Still Experiencing F004 Problems or Additional Fault Code Issues? Priorclave Can Help<\/h2>\n<p>If the error persists after completing these steps, consult our <a href=\"https:\/\/www.priorclave.com\/en-us\/2026\/04\/06\/tactrol-control-fault-codes-and-warnings\/\">full Fault Codes guide<\/a> or contact <a href=\"https:\/\/www.priorclave.com\/en-us\/support\/contact-technical-support\/\">Priorclave&#8217;s service team<\/a> for further assistance.<\/p>\n<p>Priorclave is proud to offer a 36-month\/10,000 cycle limited parts-and-labor warranty, a 20-year pressure vessel warranty, and unlimited lifetime technical support for every autoclave we sell. Our comprehensive warranty and support covers all core components and every operating feature.<\/p>\n<p>Ready to outfit your lab with reliable, efficient, low-maintenance autoclaves? Please <a href=\"https:\/\/www.priorclave.com\/en-us\/contact-us\/\">reach out<\/a> to us today\u2014we are eager to help!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Like the \u201cCHECK ENGINE\u201d and \u201cMAINTENANCE\u201d lights on your car dashboard, your Priorclave has a set of \u201chidden until lit\u201d warning lights to tell you when something is amiss. These [&hellip;]<\/p>\n","protected":false},"author":13,"featured_media":2437,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[465],"tags":[361,80],"class_list":["post-3506","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-lab-practices","tag-autoclave-tips","tag-tips-and-tricks"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Troubleshooting the F004 Error Code: \u201cLow Water\u201d (Even When You Think You Have Plenty)<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.priorclave.com\/en-us\/2024\/12\/30\/troubleshooting-the-f004-error-code-low-water-even-when-you-think-you-have-plenty\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Troubleshooting the F004 Error Code: \u201cLow Water\u201d (Even When You Think You Have Plenty)\" \/>\n<meta property=\"og:description\" content=\"Like the \u201cCHECK ENGINE\u201d and \u201cMAINTENANCE\u201d lights on your car dashboard, your Priorclave has a set of \u201chidden until lit\u201d warning lights to tell you when something is amiss. 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