01
Symptom summary
Tap what's off. Get a clean description.
We ask three small questions about the fault — cold spots, noises, pressure, codes — then write it back to you in the shape an engineer expects to hear.
When the heating plays up,steady the storyfirst.
AST Heating is a calm, plain-English helper for homes everywhere — when the boiler flashes a code, a radiator turns half cold, or the thermostat won't listen. We don't send engineers. We help you describe the fault, prepare for the visit, and translate the advice afterwards.
- Since 2014
- USD · credits
- Homes worldwide
“A quiet evening begins
with a steady radiator.”
21.4°C
+ warming
Top half cold, bottom warm. Bleed key missing. Last service 2024.
cold-topbleed
Not a service desk.
Just a steadier
way through.
When the heating plays up, the hardest part isn't fixing it — it's working out what to say, what to check, and what the engineer's note actually meant. AST does four small things well, so the rest of the day can carry on.
02
Pre-repair checklist
Before the engineer rings the bell.
A short checklist tuned to your fault: meter reading, boiler pressure, last service date, model, access notes. Printable. Saves one wasted call-out, quietly.
03
Description generator
A message you can paste to anyone.
We write the booking message for you — what's wrong, when it started, what you tried, what's safe. One tap to copy.
04
Advice translator
Engineer-speak, in plain English.
Paste the note from your last service. We translate phrases like 'balance the system' or 'PRV discharging' into what it actually means and what to do next.
Four mornings
that usually need
a calm step-through.
Pick the one that sounds like yours. AST adjusts the checklist and the description to match — no generic advice.
A radiator that stays cold
Front room won't warm. Top cold, bottom warm.
A boiler showing a fault code
E133, lockout, low pressure — we recognise them.
Winter care, already overdue
A short list before the first real cold snap.
A new place, unfamiliar heating
Where's the stopcock? What's the boiler model?
A checklist
and a message.
Every check ends with two things you can use immediately: a short list to tick off before the engineer arrives, and a ready-made message to paste into a booking form or a text.
Before the engineer arrives · front-room radiator
- Boiler pressureRead the gauge. Photograph it.
- Boiler modelLabel is usually on the underside.
- Last serviceFind the card or check the email folder.
- Cold spotsMark top or bottom on each radiator.
- Bleed keyLocate it, or buy a 50p one from a hardware shop.
- AccessNote any furniture in front of valves.
The message, ready to send
Hi — booking a visit for our heating.
Issue: front-room radiator half cold. Top stays cool, bottom warms up. Started Sunday evening. Other radiators fine.
Tried: thermostat turned up, TRV opened to 5, no change. Bleed key not found.
Kit: Worcester Bosch Greenstar 30i, last serviced Oct 2024. Pressure 1.2 bar.
Access: weekdays after 3pm. Parking on street.
Three ways to pay.
All in credits.
1 USD = 100 credits. Every tool shows the cost before you press run. Start with 500 free credits — no card.
Start free
500 credits on signup — enough for 100 Symptom Checks or 1 full Winter Review.
$0
Pay-as-you-go
Buy a credit pack outright, from $9. Credits sit in your account for 12 months.
from $9
Subscribe
3,000 credits every month on Home ($29). Pro at $79 adds Winter Review and the full fault-code library.
$29
“We built AST for the morning someone stands in the hallway, tapping a radiator, wondering whether to ring the landlord, the engineer, or their mum.”
A registered company.
Built for homes
on every continent.
- AST HEATING LIMITED
- SC482919
- 2014-07-25
- Scotland, United Kingdom
- 9 Pitcruvie Park, Lundin Links, Leven, Fife, KY8 6HY
Start with
a cold radiator,
or a strange noise.
Three taps, a short read-back, and a message you can paste. AST stays with you until the engineer arrives — and until you understand the note they leave behind.