EE on a Worcester Bosch Bosch Compress 2000 AWF: Alarm table: EEprom hydraulic module failure / Troubleshooting table: EEPROM control board main hydraulic module control board failure
Short answer
On a Worcester Bosch heat pump, EE means: Alarm table: EEprom hydraulic module failure / Troubleshooting table: EEPROM control board main hydraulic module control board failure. The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: Alarm table: EEprom hydraulic module failure / Troubleshooting table: EEPROM control board main hydraulic module control board failure.
Part involved: hydraulic module main PCB EEPROM.
When it shows: EEprom hydraulic module failure.
Likely causes:
- EEPROM parameter error; faulty EEPROM chip; faulty main hydraulic module control board.
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
Resetting itself: no.
Manual reset: Manual 13.2: switch the unit off and on again to reset the safety device; if reset fails contact dealer. Manual 11.4 warns repeated resets can cause irreversible damage.
What you can check
- Read and note the full code (and sub-code) shown on the controller and pass it to your installer.
- Manual 13.2: one off/on restart may be tried; if the code returns, stop and call an engineer - repeated resets can damage the unit.
What the engineer will check
- Rewrite EEPROM data; replace EEPROM or main hydraulic PCB.
Who to ask for: heat pump installer / electrician.
Certification: Electrical work to BS 7671 by competent person.
What you might notice
What owners and engineers report
1 owner and engineer report mentions this.
- Heat pump will not start on the Bosch Compress 2000 AWF (R32 all-in-one monobloc): 1 report
Sources
- Installation and operating instructions Compress 2000 AWF CS2000AWF 4-30 R-S/T ↗ · 6721859133 (2025/10) · page 128; 136 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026