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Pentair Pool Products MiniMax 250 Operating & Installation Manual: Troubleshooting (general)

Low nox series pool & spa heaters.
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Troubleshooting - General
Possible Cause
Heater will not come on
Automatic ignition system fails
Pump not running
Pump air locked
Filter dirty
Pump strainer clogged
Defective wiring or connection
Defective pressure switch
Defective gas controls
On-Off switch in "OFF" position
Heater Short Cycling
Insufficient water flow
Defective wiring
Defective flow valve or out of adjustment
Defective hi-limit and/or thermostat
Heater Makes Knocking Noises,
Make sure all valves on system are open
Heater operating after pump has shut off
Heater exchanger scaled
Please consult the latest edition of the "MiniMax NT Low NOx Service Manual" for complete service and
repair instructions. Repairs should only be attempted by properly trained service personnel.
P/N 471593
Check if electrical connections are
correct and securely fastened –
If YES, call serviceperson.
Place pump in operation
Check for leaks
Clean filter
Clean strainer
Repair or replace wires
Replace switch
Call serviceperson
Turn switch to "ON"
(Rapid On and Off Operation)
Clean filter and pump strainer
Repair or replace wiring
Call serviceperson
Call serviceperson
Shut off gas supply and call serviceperson
Shut off gas supply and call serviceperson
Rev. C 11-1-01



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  • Ken Lobsinger Mar 14, 2016 02:53:
    none yet... this is required to see the manual.