Short answer: HPt, Hd, and Prr are probe/heater-safety style codes. They are different from simple maintenance reminders and should not be ignored.
Contents
Quick lookup
Code |
Meaning |
Owner-safe first step |
|---|---|---|
HPt |
Heater probe test failed. |
Reset once; service if it returns. |
Hd |
Hi-limit probe disconnected from board on systems that use this message. |
Do not keep running; service-level inspection. |
Prr |
Temperature probe problem/disconnected. |
Reset once; service if it returns. |
Why these codes matter
The spa needs reliable temperature and heater-safety readings. If a probe is disconnected or failing, the controller may not be able to safely manage the heater. That is why these codes deserve more caution than a cleaning reminder.
What owners can check safely
- Power cycle once at the breaker.
- Confirm the code is not a one-time startup glitch.
- Do not open electrical/heater compartments unless qualified.
- If the code returns, call a qualified spa technician.
How this differs from flow/filter codes
Flow codes like FLO or FLC can sometimes be tied to dirty filters or low water level. HPt, Hd, and Prr are more directly tied to probes or heater safety. If you also see flow warnings, use the FLO/FLC guide; otherwise do not assume a filter swap fixes a probe code.
Related guides
FAQs
What does HPt mean on an Arctic Spa?
HPt means the heater probe test failed. If it returns after startup/reset, the heater probe or related system should be inspected.
What does Hd mean on an Arctic Spa?
Hd can indicate the hi-limit probe is disconnected from the board on systems that use that display message.
What does Prr mean on an Arctic Spa?
Prr points to a temperature probe problem, such as a disconnected or failed temperature probe.
Can I fix probe codes by cleaning filters?
Usually no. Filters are important for flow codes, but HPt, Hd, and Prr are sensor/probe/heater-safety messages. Clean filters may help general flow but will not repair a disconnected probe.
Should I keep using the spa with probe codes?
No. Probe/heater safety codes should be treated seriously because the system may not be able to read or control temperature correctly.
References
This guide is an independent aftermarket support resource. Spa Filter Adapter is not affiliated with or endorsed by Arctic Spas. Official Arctic Spas support/manual pages were used as references and linked nofollow below.