Pd on an Ideal Heating HP290: Condensing Temperature High
Short answer
On an Ideal Heating heat pump, Pd means: Condensing Temperature High. The manual does not say whether the heat pump stops. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: Condensing Temperature High.
Part involved: condensing pressure/temperature.
Likely causes:
- Pressure sensor reading (P1 = P2); snow/ice on outdoor unit; blocked/dirty air HX; insufficient clearance; fan fault; EEV fault/wiring; refrigerant charge.
Is it safe?
| Does the heat pump stop? | Not stated |
|---|---|
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
What you can check
- Note the code or fault message shown on the controller/Halo and when it appeared; check the heat pump's isolator and consumer-unit breaker are on. Check the outdoor unit is not blocked by snow, ice, leaves or stored items and that air can flow freely around it.
What the engineer will check
- As flowchart 9.1.31: compare pressures, check airflow, fan, EEV, recharge; replace outdoor PCB/low pressure sensor.
Who to ask for: Heat pump engineer competent with R290 (A3, highly flammable); refrigerant-circuit work requires Cat I/II F-gas plus City & Guilds 6187-21 or equivalent (I&M p.93 warning).
Certification: F-gas Cat I/II + C&G 6187-21 (R290) for refrigerant work; electrical work by competent person.
Sources
- HP290 Monobloc Heat Pump System - Installation & Maintenance (UIN 240080 A09) ↗ · UIN 240080 A09 · page 110 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026