Patience Is Rewarded
Like most folks in Cuenca, we have a tankless water heater, a calefon, which is bolted to an outside wall. It is terrific, but can be finicky for safety reasons. E.g., if anyone flushes, the pressure drop will cause the heater to shut off. Then you have to shut the HW faucet off, wait a minute or so for the flushed toilet somewhere in the house to refill, and turn the water back on. So today it wasn't heating any water. Last time, it needed a new D-battery which provides the spark. but this time, plenty of spark, no gas. Took the cover off and had my daughter turn the water on and off in the house while I watched. Turned out a solenoid had got stuck, and wasn't letting the pilot have any gas. A bit of wiggling and it was happy again.
