Pentair Mastertemp / Waterco Turbotemp Gas Heater REPAIRS AND Services

Pentair Mastertemp


Pentair Mastertemp pool heaters were popular for a few years by many pool builders. As they are complex and not many people know how to work on these, many builders have moved on to other brands. We see more blown heat exchangers on these than any other heater.  

Models: Mastertemp 125 HD, 200 HD, 300 HD, 400 HD

Waterco Turbotemp


Waterco Turbotemps were simply a re-branded Pentair Mastertemp. Waterco has moved on from these heaters. Waterco now recommends a different brand of heater.
Models: Turbotemp 125, 200, 300, 400

Sta-Rite Max-E-Therm


Yet another re-branded Pentair Mastertemp, this time with a different outside casing. The internals are identical.
Models: Max-E-Therm 200, 300, 400

About Pentair Heaters


We carry almost all spare parts on-board, and were an Authorized Service Agent.   We only supply these heaters where space is a requirement, and handle all Warranties directly. We do not recommend Pentair Heaters for most installations.

More Information


They use a finely tuned fan-forced blower for efficiency. Unfortunately they succumb to any problem with water flow and gas supply pressure. Their Heat Exchangers appear to be more prone to issues with water chemistry. 

Pentair / Waterco / Sta-Rite Troubleshooting

Pentair Mastertemp Error Codes & Troubleshooting

Pentair Mastertemp, Waterco Turbotemp, Sta-Rite Max-E-Therm Gas Heater Error Codes:

Service System LED On - Heater not detecting water pressure. Make sure valves in correct position, filters clean, and sufficient water flow through heater.

Service Heater LED On - Cycle Mains power off, then on. Try again. If fault reoccurs, see below.

Other Codes that may be seen:

AGS - Gas Shutoff. Temperature in heater is too high.  Call for Service.

HLS - Hi Limit Switch Opened - Call for Service.

PS - Pressure Switch Opened. Clean filters and ensure correct water flow. If this reoccurs, Call for Service.

AFS - Air Flow Switch Failure. Do no operate heater. Call for Service.

SFS - Stack Flue Sensor Error. Combustion may be incorrect.  Call for Service.

E01 - Temp Sensor Failed. Water chemistry may be incorrect. Call for Service.

E02 - High Limit Sensor Failure.  Ensure water flow is correct. If this reoccurs, Call for Service.

E03 - Thermal Fuse Failure. Temperature exceeded limits. Do not operate heater.  Call for Service.

E04 - Fan Sensor Failure.  Sensor error or blocked / sooted heat exchanger. May be bad gas supply or failed parts. Do not operate heater. Call for Service.

E05 - Stack Flue Sensor Failure.  Sensor error or blocked / sooted heat exchanger. May be bad gas supply or failed parts. Do not operate heater. Call for Service.

Other Issues That Require Service:

Loud, high-pitched whine - Flame is too rich. Call for Service.

Flame is “fluttery.” Flame is too lean. Exhaust may have acrid smell or burner may fail

to stay lit. Call for Service.

Burner pulsates or Exhaust vent is too long. Reduce length of exhaust vent and/or surges, especially on number of elbows. Call for Service.

Boiling in heat exchanger - Low water flow to heater, pump and or filter. May be accompanied by water “bumping” sounds. Do not use heater. Call for Service.

R13 / R8 - Part of Startup Sequence. Wait for next step. 

Smoke or Steam coming from heater. Switch heater off, and gas valve off. Do not use heater. Call for Service.

Frozen Screen - Heater may have restarted too many times. May be gas supply issue. Call for Service.

If any of the above continue, please Contact us for Service