Check if voltage from switch to transformer if yes and no voltage out bad transformer
The 24v is called the secondary and sometimes called the out-put. Make sure you have 240v on the primary, sometimes referred to as the in-put. If you have primary voltage then you should have secondary voltage, if not then replace transformer. Make sure the secondary, 24v control fuse is the correct size and present. If the secondary is shorting together or to ground somewhere, it will cause damage to the transformer.
SOURCE: 1 year old hayward h1001d pool heater clicking
see this link ....
http://www.fixya.com/support/t1078177-hayward_pool_heater_h_series
SOURCE: hayward pool heater c4205 has error message of LO
lo usually indicates insufficient water flow and/or pressure switch malfunction.make sure filter is clean and pressure is in normal range
SOURCE: Hayward pool heater - p5 code
The code is "PS" for Pressure Switch and means there is insufficient pressure to operate (low flow) or the switch itself is bad.
SOURCE: CE error code on hayward pool heater
CE= Communication Error between Control Module
and Display Interface Assembly
1. Disconnect and then reconnect power to heater.
2. Check for faulty wiring or connection.
Inspect Display Interface Wiring. Ensure Display Interface Plug is securely attached to Control Module. .
3. Control Module and/or Display Interface Assembly
are defective.Replace Control Module and/or Display Interface Assembly.
Here is a linkt oH aywardmanuals:
http://www.haywardnet.com/inground/products/manuals.cfm
SOURCE: Five year old Hayward H400IdL2 makes a banging
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Does the banging continue until the heater eventually shuts off or does it quit shortly after the heater burners start up? In either case you can repair the heater for much, much less than a new unit. The bypass may be the issue if it is stuck closed. You will also want to inspect the control valve in the header and inspect the overall condition of the heat exchanger. It is likely aggressive water has damaged some or all of these parts causing the banging noise you hear. It is also possible there is an issue with the pump and/or filter not getting enough flow thru the heater but I have to assume your pool man eliminated those possibilities when he looked at the heater.
Was the pool man not able to repair or at least inspect the heater further for you?
John
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