No Hot Water? Water Heater Troubleshooting Guide
The common causes of no hot water from your water heater, the safe checks you can do yourself, and when to call a licensed technician.
By the CANRO Heating & Cooling technical team · Licensed HVAC & gas-fitting contractor, Metro Vancouver · Last updated May 2026
No hot water is usually a pilot or ignition issue on a gas tank, a tripped breaker or failed element on an electric tank, a tripped thermostat or gas-supply problem, or a fault code on a tankless unit. A few checks are safe; gas, electrical and tankless faults need a licensed technician. Call (604) 359-1081 and we will diagnose it properly.
Why your water heater may not be working
Below are the most common reasons for no hot water from your water heater, what each one means, and which you can safely check yourself before calling a technician.
| Likely cause | What it means |
|---|---|
| Gas tank: pilot/ignition out | The pilot or igniter has failed, so the burner will not light |
| Electric tank: tripped breaker or element | A tripped breaker or a burned-out heating element leaves the tank cold |
| Tripped high-limit / thermostat | A safety reset or failed thermostat has cut the heat |
| Tankless fault code | A tankless unit has locked out on an error - often venting, gas or scale-related |
| Gas supply issue | No gas to a gas water heater |
| Leaking or failed tank | A failed tank may not hold or heat water and needs replacement |
What you can safely check yourself
Before you call, these simple checks are safe for any homeowner and sometimes solve the problem:
- For electric units, check the breaker and reset if needed (once)
- For gas units, check whether the pilot is lit (per your manual) and the gas is on
- Look for an error code on a tankless unit and note it
- Confirm the temperature setting has not been turned down
- Check for leaks or water around the base of the tank
- Confirm other gas appliances work (gas-supply check)
When to call CANRO
If the safe checks above do not restore normal operation, it is time for a licensed technician. We diagnose the real cause of no hot water from your water heater, quote a firm price before any repair, and fix it properly - we have served Metro Vancouver since 1999.
Frequently asked questions
Why do I suddenly have no hot water?+
My water heater is leaking - is it an emergency?+
Why is my tankless unit showing an error code?+
Can I relight the pilot myself?+
Still stuck with no hot water from your water heater?
Get a proper diagnosis and a firm price from a licensed local team. No surprise charges. Serving Metro Vancouver since 1999. Call (604) 359-1081.
