RTO Water Heaters - Page 4 - Recent Questions, Troubleshooting & Support

if you haven't already ,check thermostat, check inline fuse, check ground wire.

igniter coil could be bad.it creates a high voltage spark across the electrode. be sure electrode is set to specs.

Yes the faucet could be a problem. Try changing for one which you know is ok.
The long run of pipework - each bend, elbow or joint all have a reducing effect on the flow, maybe enough to matter with a restricted outlet. none of this can be altered except by renewing with larger bore pipe - expensive!
Also there should be a dirt filter in the mains water input line/pipe. Try removing & cleaning. Try also removing , reconnecting and then the hot tap [faucet]

The boiler will have an actuator valve which fires it up when a certain flow of water is reached. If the flow is reduced AND the valve is worn, maybe a replacement. Not sure about it's USA construction but in the UK [it's called a diverter valve] many have a rubber diaphragm which is cheap to replace
Check also if it uses a flow sensor switch
Had a look at the Takagi web site and there are pdf's of manuals
takagi.com
Overall I am still thinking that the main prob is in the flow.
Hope I've helped - come back anytime
Rod.Davies

If you had a power surge at your home, and no more power seems to be going to the heater, you must make sure that none of your wires from the load center all the way to the heater are intact and all have been wired correctly and none are lose. If you must be very careful reading manufacturing dates as these dates are actually displayed backwards and the year is actually displayed as the month, you may in fact have an older heater, as sometime when these heaters are purchased by distributors they don't get to sell them until way after or they have had one in storage for a while when they decide to sell them. I have spoken to the guys at the factory and they are very informative, I don't see how they could not help you as I deal with them on a daily and we always try and help there customers, why don't you bring the heater in there service department is great it only takes 5 minutes to fix the heater. If you mail it in its only 24-72 hr turn around.

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