No Hot Water
NO HOT WATER MAY BE A SIMPLE FIX
Your tankless water heater may be showing an error code, if so it may be a simple adjustment, follow the instructions in your owners manual. most common problems for a gas tankless not to provide hot water could be the electric GFCI or panel box breaker may have tripped, check this first, second and most common problem would be your tankless is in need of servicing (flushing) call us to schedule this service.
IT CAN HAPPEN TO THE BEST
Keep in mind most quality tankless water heater usually are trouble free if maintained according to manufactures recommendations, most quality tankless models provide
self diagnoses as to the problem and solution, however on occasion if a faulty part is to blame, most all parts are inexpensive and usually are covered by long term warranty.