E4
Canon • PIXMA MegaTank Printer
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Moderate DIY
Canon PIXMA MegaTank Printer Error Code E4: Meaning, Causes & Fix
Verification
95% Official
Manufacturer Guide
What Does Error E4 Mean?
Water Temperature Thermistor Circuit Fault
Diagnostic Tree & Resolution Protocol
Official manufacturer root cause analysis and step-by-step diagnostic workflow.
#1 Most Common
Clogged filter or pinched hose
Clogged filter or pinched hose
Diagnostic Checklist:
1
Step 1: Power off machine and unplug from wall socket for 5 minutes.
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2
Step 2: Test NTC sensor resistance using a multimeter; replace sensor harness if open circuit.
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3
Step 3: Reconnect power and run short diagnostic spin/drain cycle.
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#2 Most Common
Control board transient glitch
Control board transient glitch
#3 Most Common
Sensor line interruption
Sensor line interruption