What to Do When Heating Doesn't Work? Step-by-Step Guide

Step 1: Stay Calm and Check the Basics

The first thing you need to do when you discover that the heating isn't working is not to panic. Most malfunctions have a simple solution that you can handle yourself in a few minutes. Before calling a service, check these basic things: If the problem isn't resolved after the basic check, the next step is heating work in Bratislava.

• Boiler is on - Check if the boiler is not turned off at the main switch or via the control panel
• Electrical power - Check the circuit breaker in the distribution box to see if it hasn't tripped
• System pressure - The boiler's manometer should show pressure between 1-2 bar (green zone)
• Gas valve - If you have a gas boiler, make sure the gas supply is open
• Thermostat set correctly - Check if the desired temperature is higher than the current one

Step 2: Check the Boiler Display - Error Messages

Modern boilers have error codes on the display that precisely show where the problem is. Most common error messages and their solutions:

Step 3: Add Water Pressure (if too low)

The most common cause of non-functional heating is low water pressure in the system. The ideal pressure is 1.2-1.5 bar with a cold system. How to add water:

1. Turn off the boiler - Safety first
2. Find the filling valve - Usually a small black hose under the boiler with a turn valve
3. Slowly open the valve - Open carefully, you'll hear the sound of flowing water
4. Watch the manometer - When pressure reaches 1.5 bar, close the valve
5. Close the valve and check - Make sure the valve is completely closed (not leaking)
6. Turn on the boiler - The boiler should start automatically

Step 4: Bleed the Radiators

If the boiler is running but radiators are cold or only partially warm, the problem is probably air in the system. Bleeding radiators is a simple task:

• Prepare a container and cloth - Under the bleed valve
• Find the bleed valve - Small valve on the side of the radiator (top)
• Open the valve with a special key - Or screwdriver (depending on type)
• Wait until it stops hissing - Hissing = air escaping (that's good)
• When water starts dripping - Immediately close the valve
• Repeat on all radiators - Start from the lowest floor

Step 5: Restart the Boiler

If none of the above helped, try a hard reset of the boiler. It often solves temporary software errors:

1. Turn off the boiler at the main switch or via the control panel
2. Disconnect the boiler from the electrical network - Turn off the breaker in the distribution box
3. Wait 5 minutes - Let the electronics completely discharge
4. Reconnect the electricity - Turn on the breaker
5. Turn on the boiler - Wait until it starts up (approx. 1-2 min)
6. Check the display - To see if it's showing an error

When to Call Emergency Service?

Some problems CANNOT be solved by yourself and require immediate intervention by a professional. Call emergency service if:

• You smell gas - Immediately close the gas supply and call the emergency line
• Water pressure drops quickly (water leak somewhere in the system)
• Boiler makes unusual sounds - Humming, banging, cracking
• Water is leaking from the boiler - Risk of flooding
• Critical error is displayed (F28, F29, E35, etc.)
• None of the above solutions helped
• Temperature in the apartment drops below 15°C - Risk of pipe freezing

Prevention: How to Prevent Heating Malfunctions

Most heating malfunctions can be prevented with regular maintenance and inspection. Here is a checklist for autumn (before the heating season):

• Annual boiler service - A professional will check, clean and adjust the boiler
• Check pressure - Should be between 1-2 bar
• Bleed radiators - Before the heating season starts
• Clean the boiler - Dust the inside and around the boiler
• Check the chimney - Make sure it's not blocked (important for safety)
• Test the boiler dry - Turn on the heating for a few hours, even if it's not cold outside yet

Conclusion: Don't Be Afraid to Call a Professional

Although you can solve many heating problems yourself, remember that a boiler is a complex device where every mistake can have serious consequences. If you're not sure, call a professional. The cost of an emergency call is always lower than the cost of a damaged boiler, frozen pipes or - in the worst case - health problems caused by improper gas repair.

Our team is ready to solve any heating problem 24/7 nonstop - whether it's the middle of the night or the weekend. Fast service call, our own mobile workshop and transparent price already over the phone.