CODE 01
No hot water at all
Likely cause: On gas units, a tripped pilot or failed thermocouple is most common; on electric units, it's usually a blown upper heating element or tripped high-limit switch.
Our fix: On-site testing of the gas valve, thermocouple, or elements, with same-truck replacement parts for most models.
See repair details →
CODE 02
Rusty or discolored hot water
Likely cause: A corroding anode rod or the start of tank corrosion — especially in units past year 6 on Cincinnati's harder municipal water.
Our fix: Anode rod replacement if caught early; if the tank itself is corroding, we'll show you both repair and replacement pricing.
See maintenance options →
CODE 03
Popping or rumbling noises
Likely cause: Sediment buildup at the bottom of the tank trapping and re-boiling water — common in units that haven't been flushed in 2+ years.
Our fix: Full tank flush and sediment removal, restoring efficiency and quieting the unit in one visit.
See maintenance options →
CODE 04
Water pooling at the base
Likely cause: Could be a loose drain valve or fitting (easy fix) or a cracked inner tank (not repairable). A failed T&P valve can also cause dripping.
Our fix: We isolate the source immediately — if it's the tank itself, we treat it as an emergency replacement.
See emergency service →
CODE 05
Inconsistent or fluctuating temperature
Likely cause: A failing thermostat, a lower heating element going out, or, on tankless units, a flow sensor or scale buildup restricting flow.
Our fix: Component-level testing to find the exact failure point rather than guessing — then a fixed-price repair.
See tankless repair →