E02.13 on a Baxi heat pump: Blocking Input Blocking Input of the Control Unit from device external environment
Short answer
On a Baxi heat pump, E02.13 means: Blocking Input Blocking Input of the Control Unit from device external environment. The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 2 sources
What it means
On the Assure Split ASHP (AWHP 4.5/6/8 MR + Assure AWHP-IDU 4-8 E)
The manual says: Blocking Input Blocking Input of the Control Unit from device external environment.
Part involved: PCB communication wiring.
Likely causes:
- Input BL open. Check the wiring. Check the component connected to the BL. contact Check the component connected to the AP001 and AP100. contact.
On the HP60 / Baxi Assure HP55 High Temperature Monobloc ASHP (R290)
The manual says: Blocking Input Blocking Input of the Control Unit from device external environment.
Part involved: PCB communication wiring.
Likely causes:
- Check the wiring Check the component connected to the BL. contact.
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: Remove cause, then acknowledge the error manually on the user interface (engineer).
What you can check
- Note the exact code shown on the controller and when it appeared.
- The manual's user steps allow switching the system off and on once to see if the error clears; if the code returns, contact the installer.
- If the code persists or returns, contact a heat pump engineer.
What the engineer will check
On the Assure Split ASHP (AWHP 4.5/6/8 MR + Assure AWHP-IDU 4-8 E)
- Input BL open. Check the wiring. Check the component connected to the BL. contact Check the component connected to the AP001 and AP100. contact.
Who to ask for: heat pump engineer (controls / sensors).
Certification: Manufacturer-trained heat pump engineer.
On the HP60 / Baxi Assure HP55 High Temperature Monobloc ASHP (R290)
- Check the wiring Check the component connected to the BL. contact.
Who to ask for: heat pump engineer (controls / sensors).
Certification: Manufacturer-trained heat pump engineer.
What you might notice
Sources
- Installation and Service Manual - Air/water 'Split Inverter' heat pump Baxi Assure, Assure AWHP-IDU 4-8 E ↗ · 7762758 - v05 - 19082020 · page 93 · Reviewed 23 September 2026
- Installation, user and service manual - Indoor unit ASHP Control ↗ · 7887625 - v04 - 22072025 · page 134 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026