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Error code reference
Bosch Heat Pump Error Code E5
High/low voltage protection-power supply ≥270V or <172V.
SourceBosch IDS 2.0 Split System Heat Pump - Full Service ManualSection 12.3.3, page 44
Diagnostic procedure
The full E5 procedure
Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.
MyPros+ · DiagnosticsStep 1 preview
1
First diagnostic step
Check if the high voltage power supply is ≥270V or <172V; correct power supply or call utility provider.
SourceBosch IDS 2.0 Split System Heat Pump - Full Service ManualSection 12.3.3, page 44
More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
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Where this code is documented
1 manual in the MyPros+ library documents this code for Bosch heat pump.
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