Balboa · BP series (TP400, TP600, TP800, TP900, spaTouch panels)Fix soon

HTR FLOW FAIL on a Balboa hot tub: heater flow failed

There is not enough water flow through the heater and the heater has been disabled. It will not restart until you fix the flow problem and press a button to reset.

Also shown as: M017, LF, The water flow has failed

Most likely causes

  1. 1Clogged or worn-out filtermost likely
  2. 2Low water levelcommon
  3. 3Air lock in the pumpcommon
  4. 4Failed circulation or jet pumpless common

What to try, in order

  1. Top up the water if it is low.
  2. Turn off power at the breaker and clean or replace the filter.
  3. Check that all slice valves are open and jets are open.
  4. Restore power, bleed any air lock, and confirm water is moving at the jets.
  5. Press any button on the panel to reset the message.
  6. If it returns within a day, stop resetting it and book service.

HTR FLOW FAIL questions

What does M017 mean?

M017 is the Balboa BP message code for a heater flow failure. It is the persistent version of M016 and needs a manual reset.

How do I reset HTR FLOW FAIL?

Fix the flow problem, then press any button on the topside panel. Resetting without fixing the cause only brings the message back.

Related codes

Balboa -- · Temperature not yet knownBalboa CHEK PH · Maintenance reminderBalboa CLN FLTR · Filter reminderBalboa CNFG FAIL · Configuration errorBalboa dr · Heater may be dryBalboa dry · Heater is dryBalboa Ecn · Economy modeBalboa FLO · Low water flow

General guidance. Follow your manufacturer's instructions; anything inside the control box is work for a licensed professional. Updated October 5, 2026.