Bosch SHP65TL5UC Repair Instructions page 68

Error
Description
Code
E:23 Faulty drain pump
E:24 Dishwasher won't drain
E:25 Drain pump is blocked
E:26 Faulty water switch
E:28 Aqua sensor not
calibrated
702_58300000170749_ara_en_c
Part DW Symptoms
Water switch runs continually
properly Aqua sensor doesn't run during wash cycle
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(seen during wash cycles)
Check continuity between drain pump (m3) and power
module.
Measure drain pump resistance between any 2 terminals. If
≈ 80.5 Ω @ room temp, replace power module. If not,
replace drain pump.
Remove garbage disposal plug.
Make sure the drain hose is < 150", includes a 33" high loop
and is installed ≤ 50" above the floor.
Unclog house drain line, drain hoses (int. / ext.), drain pump
& backflow valve.
Replace missing or reinstall loose drain pump cover.
Remove debris / obstructions from drain pump.
Remove sump drain pump cover and confirm drain pump
impeller is turning freely.
Replace missing or reinstall loose drain pump cover.
Check continuity between water switch (m5) and power
module.
Measure voltage to water switch. If ≈ 120V, replace water
switch. If not ≈ 120V, replace power module.
Check continuity between aqua sensor (b5) and power
module.
Make sure aqua sensor is clean where it enters the sump.
If electrical connections are good and the aqua sensor is
clean, replace the aqua sensor.
Solution
Page 68 of 82