Heating systems do not fail in January because January is hard on them. They fail in January because that is the first time in six months anyone asked them to do anything, and whatever went wrong in April has been sitting there quietly ever since.
Optimum HVAC covers heating across Crowborough, and this is the hour of work in September that removes most of the reasons for a cold house in the middle of winter.
Run it before you need it
Turn the heating on for half an hour on a mild day and stand in the house while it runs. You are looking for three things: that it fires and stays running, that every radiator gets hot, and that nothing makes a noise it did not make last year. A system that fails this test in September gets fixed at a normal pace; the same fault found in December is an emergency with a wait attached.
It is also worth exercising anything that has been idle. Radiator valves seize in the position they were left in, particularly thermostatic heads that have sat open all summer, and a pump that has not turned since spring occasionally needs freeing. Working the valves fully open and closed a couple of times prevents the classic single cold radiator in the first cold week.
- Run the heating for half an hour on a mild day in September.
- Check every radiator heats, top to bottom.
- Work each valve fully open and shut to stop it seizing.
Pressure, air and the two-minute jobs
Check the pressure gauge on a sealed system when the boiler is cold; most sit around one to one and a half bar. Low pressure locks the boiler out, and while topping up through the filling loop is a householder job, needing to do it repeatedly is not, because it means water is leaving the system somewhere.
Radiators cold at the top and warm at the bottom need bleeding; the reverse, cold at the bottom and warm at the top, is sludge rather than air and needs an engineer. Bleed with the system off and cool, then recheck the pressure afterwards, since letting air out drops it.
- Cold at the top means air; bleed it and recheck pressure.
- Cold at the bottom means sludge; that is a service call.
- Repeated pressure loss means a leak, not a habit.
Outside and out of sight
The condensate pipe is the single commonest avoidable winter breakdown. Where it runs outside it can freeze in a cold snap and shut the boiler down, and the time to fix that is autumn, by insulating, upsizing or rerouting it, rather than at seven on a freezing morning with warm water and a kettle.
Check the flue terminal is clear and undamaged, that nothing has grown across or been stacked against the boiler's air supply, and that any external unit or oil tank is accessible. Also check that whoever else needs access, including a meter reader or an engineer, can still reach the boiler without moving a summer's worth of storage.
- Insulate or reroute an external condensate pipe before winter.
- Keep the flue terminal and air path clear of growth and stored items.
- Make sure the boiler is physically reachable.
Controls, and booking the service at the right time
Reset the timer to the season, check the thermostat batteries, and confirm the hot water schedule still matches how the household lives rather than how it lived two years ago. If the boiler supports it, having the flow temperature set for condensing operation rather than the factory default is one of the cheapest efficiency improvements available.
Then book the annual service for early autumn. Everybody books in the first cold week, so the waiting time in October is a fraction of the waiting time in December, and most manufacturer warranties require an annual service anyway. Optimum HVAC would rather find a tired part in September than be the third call of a freezing morning in January.
Related pages
Questions customers ask
When should I book my annual boiler service?
Early autumn is ideal. The system gets tested before the first cold night, waiting times are shorter than in December, and most warranties require a service each year regardless.
My radiator is cold at the bottom but hot at the top. Should I bleed it?
Bleeding will not help. Cold at the bottom is sludge settled inside the radiator, which needs flushing or system cleansing. Air collects at the top, which is the opposite pattern.
How often should I need to top up the boiler pressure?
Once or twice a year is unremarkable. Monthly or weekly means water is escaping, whether through a weep, a passing safety valve or a failed expansion vessel, and each top-up adds fresh oxygenated water that accelerates corrosion.
Run it early, work the valves, check the pressure, protect the condensate pipe and book the service before the rush. An hour in September buys a quiet winter.
Optimum HVAC covers Crowborough for heating and boiler work. The contact page takes autumn service bookings.
