What causes error code LO on a Hayward pool heater?

This answer was rated: What causes error code LO on a Hayward pool heater? Generally, LO refers to the pressure switch, water pressure. This can be caused by either the diaphram in the flow switch has failed or the filters is clogged and/or pump is unable to make enough pressure to make the switch.

Is the Lo code normal for Hayward Canada?

I called Hayward Canada last week and apparently that service light and the LO code is normal when the heater is off. I don‘t recall that happening when I had the single speed pump and tried to turn heater off but I was assured by Hayward at this is “normal”.

What does Lo mean on a hot water heater?

Generally, LO refers to the pressure switch, water pressure. This can be caused by either the diaphram in the flow switch has failed or the filters is clogged and/or pump is unable to make enough pressure to make the switch. Open the front panel of the heater and look up in to the right.

What kind of pool pump does Hayward Hayward use?

We got a new Hayward H150FDP Universal H-Series Low NOx 150,000 BTU Gas Residential Pool and Spa Heater and after following direction getting LO error. Water pressure is showing green on pool pump, Where do i get help to fix this?

How to check your heater’s power to high limits?

Check wires to Fusible Link, replace Fusible Link. Correct excessive heat problem in cabinet. Possible rollout. YES STEP 8 –Check power to High Limits 24 VAC between Black (8) wire on PIB and Yellow (1) wire on Transformer? NO Recheck power at Blue (7) wire. If 24 VAC at Blue but not Black, replace PIB. STEP 9 Check thru High Limits

Why did I get a high limit 2 fault?

It was not a particularly hot day and water flow was about as strong as it gets (no blockages and freshly cleaned filter). After the first fault, I left the heater off for about 30 min with the pump running, then turned it back on. It fired up fine, ran for a few hours and then I got another high limit 2 fault.

Where is the high limit switch on a pool heater?

Solution: Look for the high limit switch on the side of your heater near the outlet manifold. It’s possible that your heater may have two high limit switches. Do the bypass test for each limit switch separately – if bypassing one of the switches causes the heater to fire, replace that switch.

What should I do if my pool heater is not turned off?

– If rectification is not confirmed power to gas valve shuts off after 7 seconds. – 2 additional tries (3 total) then shut down/lock out. – Turn heater off, then back to pool or spa to reset. If the heater is not turned off it will automatically reset after one hour.

Why does my pool heater keep going down hill?

The utility says pressure is max allowed. Also why would this thing work for years.. There is an adjustment that can be made on the gas valve inside the heater. Over time a very few gas valves will start to go down hill and you might need to tweak but it’s somewhat rare.

What kind of heater do I need for my Hayward pool?

Here’s two charts for Hayward pool heater troubleshooting, the first is for millivolt heaters and the one further down is for electronic or digital heaters, those that give an error code on display. Troubleshooting chart for Hayward Universal H-Series millivolt pool heaters, with standing pilot, models H150, H200, H250, H300, H350, H400

What do I need to troubleshoot my pool heater?

Having the right tools from the start helps you troubleshoot your pool heater faster. 24”Manometer (for fan assisted units, more than one manometer will be needed). Combustion Analyzer needed for all commercial units. If one day you wake up and your pool heat pump stops running, the first thing to check is your water flow.

Why does my pool heater keep turning off?

If one day you wake up and your pool heat pump stops running, the first thing to check is your water flow. Without an adequate source of water, a pool heat pump automatically shuts down to prevent overheating. This is sometimes the cause of what many describe as a pool heat pump turning off and on.