Whirlpool F33
Pump Drive System Error
Medium severityVerified Diagnostic Guide
SeverityMedium
What Your Machine Is Actually Telling You
F33 means the CCU detected a fault in the pump drive circuit — the relay or TRIAC on the board that controls the drain pump motor. This is different from a mechanical pump failure.
Common causes:
1. CCU relay burned (35%) — pump relay welded or open.
2. Drain pump short (20%) — pump drawing excess current.
3. Wiring issue (15%) — harness between board and pump.
4. Pump motor seized (10%) — causing relay to fail.
5. Power surge (10%) — damaged relay circuit.
6. Board solder crack (10%) — joint failure.
Common causes:
1. CCU relay burned (35%) — pump relay welded or open.
2. Drain pump short (20%) — pump drawing excess current.
3. Wiring issue (15%) — harness between board and pump.
4. Pump motor seized (10%) — causing relay to fail.
5. Power surge (10%) — damaged relay circuit.
6. Board solder crack (10%) — joint failure.
What You're Probably Seeing Right Now
- Machine won't drain — F33 code.
- Pump is completely silent. Or runs constantly.
- F33 appeared suddenly.
- Burning smell from control area.
DIY Fix — From Easiest to Hardest
1
Power Reset (5 minutes)
1. Unplug 10 minutes.
2. Plug back in.
3. Try Drain Only.
2. Plug back in.
3. Try Drain Only.
2
Test Drain Pump (5 minutes)
1. Unplug.
2. Disconnect pump.
3. Measure: 5-30Ω = good. OL = dead. Very low = shorted.
4. If shorted: it may have blown the relay.
2. Disconnect pump.
3. Measure: 5-30Ω = good. OL = dead. Very low = shorted.
4. If shorted: it may have blown the relay.
3
Inspect CCU Board (5 minutes)
1. Access CCU.
2. Look at the pump relay area.
3. Check for:
- Burned relay.
- Discolored traces.
- Solder cracks.
4. Advanced: some boards can have relay resoldered.
2. Look at the pump relay area.
3. Check for:
- Burned relay.
- Discolored traces.
- Solder cracks.
4. Advanced: some boards can have relay resoldered.
4
Replace CCU (20 minutes)
1. If relay area is damaged: replace CCU ($100-280).
2. Or send board for professional repair ($80-150).
3. Also replace pump if it was shorted.
2. Or send board for professional repair ($80-150).
3. Also replace pump if it was shorted.
When to Call a Pro
- •CCU board — $200-$500 installed.
- •Board repair service — $80-$150.
- •Pump + CCU combo — $250-$550.
What It'll Cost You
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Frequently Asked Questions: Error F33
What does error code F33 mean on a Whirlpool washing machine?
Connection to drain pump is lost.
What usually causes the Whirlpool F33 error?
The primary cause is: Loose wire at pump or internal pump failure.. It may also be caused by temporary sensor misreadings or wiring connection issues.
How do I reset and clear error F33?
Check wiring to drain pump. Replace pump if winding is open. If the error persists, unplug the washer from electrical power for 10 minutes to perform a complete logic board reset.
Is it safe to continue using the machine with error F33?
This code has a Medium severity level. While the machine might run, resolving the issue early prevents long-term wear on internal parts.