TradeAssistIQHome

Grant Aerona R290 fault P13

4-way valve fault

Heat pump

What it means

4-way valve fault due to reversed temperature sensor wiring, faulty valve, or faulty hydraulic PCB.

Likely causes

  1. Hydraulic PCB is faulty
  2. Wire disconnection or wiring error between the heat pump, wiring centre and touch screen display
  3. Fuse on the hydraulic module PCB may have failed
  4. Fuse on the Smart Controller wiring centre PCB may have failed

Where to start

  1. Check flow and return temperatures indicated the hydraulic PCB
  2. Check wiring between heat pump, wiring centre and touch screen display
  3. Check fuse on hydraulic module PCB

The full answer, free

  • 3 more checks in order
  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 58), right under the answer
Ask about P13 freeCreate a free account

Safety: Isolate the outdoor unit and any backup heater, and give the inverter capacitors time to discharge before you open the electrics. Anything on the refrigerant circuit needs F-gas certification.

From the Grant manual for the Aerona R290. Check the model on the data plate before you order parts.

Other Grant Aerona R290 fault codes