Igniter or control board?
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Posted

I have a two year old Pentair Mastertemp 400. A few weeks ago it stopped lighting off. The green spa/ pool heater light is green. No red service lights. No flashing led lights when control cover is removed. Fan blows, yellow heating light flashes smell of natural gas, but no light off.

Read through and performed diagnostic flow chat test in manual. Says to replace control board.

Just looking to positively confirm diagnosis.

Thank you

Brian

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Richard's picture
Tech, Pentair
I would not replace the board
Richard's picture
Tech, Pentair
Posted

I would not replace the board yet, based on your description you could have an issue with the igniter or ignition module, I would recommend to contact us at 1-800-831-7133 to troubleshoot the heater with us or this may be under warranty at this time and we would set up a service call.

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Hi Richard thanks for the
Posted

Hi Richard thanks for the reply. I rest the circuit breaker today now I get a service heater light and an ignition lockout led (3) flashes.

I checked the restance of the igniter and got a reading of 70. I then checked voltage going to igniter during start sequence and got a reading between 84-86.

Any other ideas?

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PTS's picture
Igniter should read between
PTS's picture
Posted

Igniter should read between 45-75 to be considered good, so you're within that spec.
ICM output depends on voltage incoming. 240vAC systems tend to read between 60-80vAC, 120vAC incoming reads approx. 120 to the igniter.
There tends to be very little to check on the system for an ignition lock-out, fail to fire. Once the igniter is confirmed, and the voltage is confirmed, we're only left with the incoming gas supply.
Static WC should be 8-10" WC on NG, 11-13" WC on propane, and dynamic (when the valve opens) cannot fall more than 2" from static.
Beyond that, physical issues (like soot on the flame holder) would be what we're led to.

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PTS's picture
Igniter should read between
PTS's picture
Posted

Igniter should read between 45-75 to be considered good, so you're within that spec.
ICM output depends on voltage incoming. 240vAC systems tend to read between 60-80vAC, 120vAC incoming reads approx. 120 to the igniter.
There tends to be very little to check on the system for an ignition lock-out, fail to fire. Once the igniter is confirmed, and the voltage is confirmed, we're only left with the incoming gas supply.
Static WC should be 8-10" WC on NG, 11-13" WC on propane, and dynamic (when the valve opens) cannot fall more than 2" from static.
Beyond that, physical issues (like soot on the flame holder) would be what we're led to.

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