Error Code 4C

The dishwasher is not getting enough water to run

Also displayed as: 4C

What This Means

Water supply valve is closed; Water supply pressure is too low; Aqua stop is malfunctioning; Assy guide water-sub (flow meter) fails to detect pulses; Foreign material blocking water supply line or water valve filter; Water valve coil defective; Main PBA defect

First Thing to Check

Parts Involved

How to Fix

1. 1

   1. Check whether the water faucet is open — open it if closed

2. 2

   2. Check whether the water supply has been cut off — wait for supply to resume, then restart

3. 3

   3. Check for foreign material in the water supply line and water valve filter — clean filter with a brush

4. 4

   4. Check and reconnect the water valve connector

5. 5

   5. Measure water valve coil resistance (disconnect connector first) — normal: approximately 990 ohms plus/minus 10% (890-1089 ohms)

6. 6

   6. Check whether water supply stops after water is supplied for 20 seconds — if so, replace water valve and Assy guide water-sub

7. 7

   7. Check whether water supply continues for 60 minutes without reaching target — check water supply pressure (must be greater than 0.5 bar / 7.25 psi)

8. 8

   8. Check water valve relay on Main PBA — measure voltage between Blue wire (pin 6) of CN401 and White wire of CN101 — normal: 110-120V while operating

9. 9

   9. Check the Power Relay — see Power Relay check procedure