Bosch
P2
LockoutLow pressure / heating discharge SH
Low-pressure protection in cool, or high discharge superheat protection in heat (IDS: <44 psi for 5 min cool; high discharge SH band in heat).
Walk P2 in Diagnose
Sign in for the next measurement
First check
1 Confirm this is not a fault
On the Bosch BOVA 2.0 this readout (P2) is run status, not a lockout. Write what the display actually shows and whether W/Y/G is present at the IFC.
Expect: Idle / Ht / CF / stage+CFM words change when you apply and remove the call.
If fail: If the word never changes on a real call, the call is not reaching this IFC.
If pass: The board is alive. Diagnose the comfort complaint, not this code.
The rest of the walkthrough is Diagnose.
On the plates
- Service valves open. Indoor blower on a cool call; outdoor fan on a heat call.
- Weigh-in. Restriction / TXV / drier. Then the PT (H8) before you add gas.