Heater Comes on, runs for 5-10min and shuts off with red service heater indicator and CODE C3 or 3C. But I can not find this code anywhere. Ideas?
Having an issue with the Pentair Mastertemp 250 heater.
- Thread starter PoolSmith
- Start date
MasterTemp Trouble shooting help
MasterTemp Error Codes
E01 – Open Water temperature sensor
E02 or 126 - Shorted Water temperature sensor
E03 – freeze protection (used only on Max-Plus systems)
E05 – Open stack flue sensor
E06 – Shorted stack flue sensor
_____________________________________________
Safety Circuit Switches
Normally Closed (shorted)
PS – Water Pressure Switch – MUST have water flow for switch to be closed
AGS – Automatic Gas Shut-off Switch max = 140 degrees
HLS – High Limit Sensor max = 135 degrees
SFS – Stack Flue Sensor max = 480 degrees
To display Stack Flue Temperature, hold down “Pool” button for 5-10 seconds.
______________________________________
Normally Open
AFS - Air Flow Switch
MUST be open for blower to turn on.
After blower turns on MUST be closed (shorted for safety circuit to be valid (complete) and heater to fire.
MasterTemp Error Codes
E01 – Open Water temperature sensor
E02 or 126 - Shorted Water temperature sensor
E03 – freeze protection (used only on Max-Plus systems)
E05 – Open stack flue sensor
E06 – Shorted stack flue sensor
_____________________________________________
Safety Circuit Switches
Normally Closed (shorted)
PS – Water Pressure Switch – MUST have water flow for switch to be closed
AGS – Automatic Gas Shut-off Switch max = 140 degrees
HLS – High Limit Sensor max = 135 degrees
SFS – Stack Flue Sensor max = 480 degrees
To display Stack Flue Temperature, hold down “Pool” button for 5-10 seconds.
______________________________________
Normally Open
AFS - Air Flow Switch
MUST be open for blower to turn on.
After blower turns on MUST be closed (shorted for safety circuit to be valid (complete) and heater to fire.
The following are the LEDs:
- .....PS (Pressure Switch)
- .....HLS (High Limit Switch)
- .....SFS (Stack Flue Sensor)
- .....AFS (Air Flow Switch)
- .....AGS (Automatic Gas Shutoff).
- .....Service System
- .....Thermistor
- .....Heating
- .....Pool On
- ...Spa On
- ...Service Heater.
Pentair MasterTemp Heaters - Further Reading
www.troublefreepool.com
What exact model number is the heater?
How old is it?
Is it indoors or outdoors?
Check for the LED that shows what error you have.
Can you show a video of the startup and a picture of the error code?
How old is it?
Is it indoors or outdoors?
Check for the LED that shows what error you have.
Can you show a video of the startup and a picture of the error code?
Other Codes that may be seen:
AGS - Gas Shutoff. Temperature in heater is too high.
HLS - Hi Limit Switch Opened
PS - Pressure Switch Opened. Clean filters and ensure correct water flow.
AFS - Air Flow Switch Failure. Do no operate heater.
SFS - Stack Flue Sensor Error. Combustion may be incorrect.
E01 - Temp Sensor Failed. Water chemistry may be incorrect.
E02 - High Limit Sensor Failure. Ensure water flow is correct. If this reoccurs,
E03 - Thermal Fuse Failure. Temperature exceeded limits. Do not operate heater.
E04 - Fan Sensor Failure. Sensor error or blocked / sooted heat exchanger. May be bad gas supply or failed parts. Do not operate heater.
E05 - Stack Flue Sensor Failure. Sensor error or blocked / sooted heat exchanger. May be bad gas supply or failed parts. Do not operate heater.
AGS - Gas Shutoff. Temperature in heater is too high.
HLS - Hi Limit Switch Opened
PS - Pressure Switch Opened. Clean filters and ensure correct water flow.
AFS - Air Flow Switch Failure. Do no operate heater.
SFS - Stack Flue Sensor Error. Combustion may be incorrect.
E01 - Temp Sensor Failed. Water chemistry may be incorrect.
E02 - High Limit Sensor Failure. Ensure water flow is correct. If this reoccurs,
E03 - Thermal Fuse Failure. Temperature exceeded limits. Do not operate heater.
E04 - Fan Sensor Failure. Sensor error or blocked / sooted heat exchanger. May be bad gas supply or failed parts. Do not operate heater.
E05 - Stack Flue Sensor Failure. Sensor error or blocked / sooted heat exchanger. May be bad gas supply or failed parts. Do not operate heater.
Appreciate the very informative replies - I've attached pictures of the code (none of the ones discussed) :-(
Also, to answer quesiotns, it is an outdoor unit and only 3 years old (dirty looking form wonderful pollen)
Anymore advice is appreicated before i spend a fortune on a service tech
Attachments
Check the Fenwal for an error LED.
www.troublefreepool.com
www.troublefreepool.com
Can you show a video of the startup sequence?
If you are getting a "Service Heater" LED, then you will have an error LED on the control board or the Fenwal of the 5 button heaters.
Check the diagnostic LEDs or the Fenwal box LED for blinks.
Diagnostic LEDs are on the back of the older 5 button non-connected Pentair MasterTemp heater board.
The 6 button RS-485 Connected Heater displays the diagnostics on the heater display or IntelliCenter display.
Normal boot up is 888, 128 and then rX where X is the software revision number.
The reason that it displays 888 is to prove that the display works with all parts of the display.
Most likely, the display is missing parts and the code is a partial display.
Since it says "Check Heater" you will have an error on the back of the board or on the Fenwal.
Heater Flame Sensing - Further Reading
www.troublefreepool.com
Pentair MasterTemp Heaters - Further Reading
www.troublefreepool.com
Can you show a video of the startup sequence?
If you are getting a "Service Heater" LED, then you will have an error LED on the control board or the Fenwal of the 5 button heaters.
Check the diagnostic LEDs or the Fenwal box LED for blinks.
Diagnostic LEDs are on the back of the older 5 button non-connected Pentair MasterTemp heater board.
The 6 button RS-485 Connected Heater displays the diagnostics on the heater display or IntelliCenter display.
Normal boot up is 888, 128 and then rX where X is the software revision number.
The reason that it displays 888 is to prove that the display works with all parts of the display.
Most likely, the display is missing parts and the code is a partial display.
Since it says "Check Heater" you will have an error on the back of the board or on the Fenwal.
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