IMO…
There’s not enough flow coming from heater to the shower to activate/turn-on the Hot Water Heater. That is, you have already diagnosed the problem by turning-on another faucet which allows the heater to function.
- Check for blockage at shower head (debris?)
- Try removing shower head, see if enough comes thru to activate heater
- Finally, there is a valve on the heater that can be adjusted to increase flow (IIRC, several threads on this subject. Use the SEARCH function)
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'17 Vegas 24.1
Fallbrook, CA
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