Dishwasher
I10
The I10 error code on a Hotpoint dishwasher signals a water inlet problem — specifically, that the machine isn’t filling with enough water, or isn’t filling at all. It’s one of the more common fault codes Hotpoint owners encounter, and while it can sound alarming, it’s often caused by something surprisingly simple like a kinked hose or a blocked filter. In this guide, we’ll walk you through exactly what the I10 code means, the most likely culprits, and a clear set of DIY steps you can safely try before spending a penny on an engineer.
What does this error mean?
The I10 error code on Hotpoint dishwashers (including popular models in the HFC, HFO, HIO, and HSFO ranges) indicates a water supply fault — the dishwasher’s control board has detected that the appliance is not receiving a sufficient flow of water within the expected time window at the start of a cycle. Inside your dishwasher, a component called the pressure switch (or flow meter, depending on the model) monitors how much water enters the machine. If it doesn’t register the correct water level or flow rate after a set period, it throws the I10 fault and halts the programme to prevent the machine running dry and burning out the heating element or wash pump. In plain terms: your dishwasher is telling you it’s thirsty and can’t get the water it needs to run safely.
Est. repair cost
DIY fix (cleaning inlet filter or replacing hose): £0–£20. Replacement inlet valve (DIY part): £15–£40. Professional repair (call-out, diagnosis, and part): £80–£160 depending on your region and the engineer.
🔍 Likely causes
🛠️ Step-by-step fix
Step 1 — Reset the dishwasher: Before anything else, turn the dishwasher off at the wall socket, wait 60 seconds, then switch it back on and try starting a new cycle. A temporary electronic glitch can sometimes trigger a false I10 code, and a full power reset clears it. No tools needed.
Step 2 — Check the water supply tap is fully open: Locate the water isolation tap behind the kickboard or under the sink where the inlet hose connects. It should be turned fully anti-clockwise (open). If it’s only partially open, turn it fully open and restart the machine.
Step 3 — Inspect the inlet hose for kinks or crushing: Carefully pull the dishwasher forward slightly (turn off the water supply first) and check the entire length of the inlet hose running from the tap to the back of the machine. Straighten out any kinks and ensure the hose isn’t being crushed by the machine’s weight or the cabinet. No tools needed, but a torch is helpful.
Step 4 — Check your household water pressure: Turn on a cold tap nearby. If the flow is noticeably weak, the issue may be with your mains supply rather than the dishwasher. Check whether your main stopcock (usually under the kitchen sink or where the supply enters the house) is fully open. If pressure is low throughout the house, contact your water supplier.
Step 5 — Clean the inlet valve filter screen: Turn off the water supply tap fully. Unscrew the inlet hose from the back of the dishwasher (have a towel and small bowl ready — some water will spill). Inside the threaded fitting on the dishwasher body, you’ll see a small mesh filter screen. Using a pair of needle-nose pliers or tweezers, carefully pull it out. Rinse it under the tap and use an old toothbrush to remove limescale and debris. Refit it, reconnect the hose securely (hand-tight, then a quarter turn with a spanner), restore the water supply, and test. This is one of the most effective fixes for I10 on UK machines and costs nothing.
Step 6 — Soak the filter screen in descaler: If the filter screen is heavily scaled (common in hard water areas like the South East or Midlands), soak it in a solution of white vinegar or a proprietary descaler (such as Oust or Kilrock) for 30 minutes before rinsing and refitting. Replacement screens are available online for around £3–£5 if yours is damaged.
Step 7 — Check the inlet hose for blockages: While the hose is disconnected (water turned off), hold it up and look through it or pour a small amount of water through it into a bowl to confirm it’s clear. Replace the hose if it appears blocked, collapsed internally, or cracked. A compatible replacement inlet hose for Hotpoint dishwashers costs approximately £8–£20 online.
Step 8 — Test the water inlet valve: If all the above steps fail, the solenoid inlet valve itself may be faulty. You can visually inspect it by pulling the machine out and removing the bottom access panel (unplug the dishwasher from the mains first). Look for signs of limescale build-up, corrosion, or cracking around the valve body. Replacement Hotpoint inlet valves are available for £15–£40 depending on the model. However, replacing the valve involves disconnecting electrical connectors and water fittings — if you are not confident doing this safely, skip to calling a professional.
Step 9 — If the error persists after all checks, do not continue to force cycles: Running the dishwasher repeatedly with an I10 fault risks burning out the wash pump or heating element if water isn’t actually entering the machine. Stop using it and call a qualified appliance engineer.
📞 When to call a professional
You should call a qualified appliance repair engineer if: the I10 code returns after you’ve cleaned the inlet filter, confirmed the water supply is fully on, and checked the hose for kinks; you’ve replaced the inlet hose and the fault persists; or you suspect the solenoid inlet valve, pressure switch, flow meter, or main PCB (control board) needs testing or replacing. These components require multimeter testing and involve handling electrical connectors inside the appliance — this is not a DIY task for most homeowners. When you call, tell the engineer: ‘My Hotpoint dishwasher is showing an I10 error code. I’ve checked the water supply tap, inspected and cleaned the inlet filter, and confirmed the hose is clear and undamaged, but the fault remains.’ This will save diagnostic time and money. Look for an engineer registered with the Domestic Appliance Service Association (DASA) or one who specialises in Hotpoint/Whirlpool Group appliances, as they’ll have ready access to genuine parts.
⚖️ Repair or replace?
Hotpoint is part of the Whirlpool Group, and parts availability in the UK is generally good — you can find genuine and compatible spares through retailers like eSpares, Currys Parts, and 4ourhouse. This is a point in favour of repair. If your Hotpoint dishwasher is under 5 years old, repair is almost always the right call — the I10 fault is rarely catastrophic, and even a new inlet valve or PCB repair is significantly cheaper than a replacement machine. If the dishwasher is between 5–8 years old, weigh up the repair quote carefully: if it’s under £150, repair is still sensible. If the machine is over 8–10 years old and the engineer suspects a PCB or pump issue alongside the I10 fault, replacement may make more financial sense. A decent mid-range Hotpoint replacement dishwasher (such as the HFC 3C26 W UK or similar) costs £350–£500 new. Budget brands start around £250 but often lack reliability. If repair costs exceed 50% of a new machine’s price, replacement deserves serious consideration.