I HAVE A PENTAIR MINI MAX NT 400K POOL HEATER. THE FAN COMES ON AND THE GAS VALVE CLICKS ON BUT DOES NOT IGNITE. SOME TIMES I SMELL GAS AND OCCASIONALLY IT WILL IGNITE BUT ONLY STAYS LIT ABOUT 2 SECONDS. AFTER 4-5 TIMES I GET A F5 FAULT INDICATOR LIGHT. THE IGNITOR IS GLOWING BUT NOW ITS NOT IGNITING AT ALL.
Could be dirty heater you have to clean the runners and the smole nozzles that are in the manifold below the gas valve it's like a 9/16 size you pull them off and check make sure they are clear through, sometimes little spiderwebs build up inside them. if it's all clean, then it could be you flame rectifier/ aka: flame sensing rod, that tells the htr that there is fire so it keeps running. Let me know what happened.
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All appearances - No fuel to ignite!
evrything else looks good, proper gas pressure, proper volts at igniter, etc - it should ignite! If fuel present, heater should Fire!
make sure all valves are open.
Gas valve is ON
AND purge any air from gas line.
IMPORTANT ****. If you bled gas line, don't try to ignite for a few minutes. Allow gas to dissipate first, use a fan to help.
If it is clicking it is trying to fire (calling for heat). This indicates that the internal safety loop Tstat, and IID are working. It is either a bad gas valve, your ignition wire, or lack of gas. If the gas line had been open for servicing for any length of time it can take a while for all the air to get out. Best call out a tech to do the repair, you are literally playing with fire.
wow t pool service is just guessing i guess . weel let see do u have a pilot if yes do u hear a click if yes clean t burners if not check 24v at t brown wir e for t gas valve if v replace gas valve if not replace ignition control . do u have any code on t back or t front this help a little.
1. There is air in the gas line. Power down the heater and allow it to try igniting until lockout. If it locks out, repeat the process. Most lines will clear within 4-5 attempts to ignite.
2. A plugged burner orifice. Run a small pipe cleaner in the brass fittings on the burner tray. They may have small webs in them restricting gas flow.
If the unit is a Standard (STD on the plate inside) it has a flame sensor that may also be bad. That sensor is on the end of the single wire that is cloase to the ignitor wire near the burners. Also check for a losse ground wire on the heater.