# Record an oil boiler service (CD/11) Source: https://help.mucka.ai/gas-certs/record-an-oil-boiler-service Category: Certificates Last updated: 2026-09-05 > Fill in the OFTEC CD/11 servicing and commissioning report on site, with the burner details, the service checks and your analyser readings, then send it as a PDF. The CD/11 is the OFTEC servicing and commissioning report: the record you leave behind after an oil boiler service. It covers the appliance and its burner, the service checks you worked through, and the readings off your analyser. It is the busiest of the oil forms, because most oil work is an annual service. ## Before you start Make sure Mucka knows you work with oil. Open the certificate settings (see [Set up your certificates](/help/gas-certs/set-up-gas-and-oil-certificates)) and tick **Oil**, or **Gas and oil** if you do both. Until you do, the New Certificate list only offers you the gas forms. While you are in there, add your **OFTEC registration number** and your engineers' **OFTEC technician numbers**. They print on every oil certificate. Unlike the Gas Safe numbers they never stop you approving a certificate, because oil is not a licensed trade the way gas is. If you have not got them, the certificate simply prints without them. ## Start the record Two ways in: 1. **From the job.** Open the job from [**Jobs**](/jobs) and use the certificates card. Starting it here links the client, the property and the engineer for you. 2. **From the certificates page.** Go to [**Gas & Oil Certs**](/gas-certs), tap **New certificate**, choose the **Oil** tab, and pick **Oil Firing Servicing & Commissioning Report (CD/11)**. If your job types include **Oil Boiler Service**, Mucka already knows that job wants a CD/11 and will offer it on the job itself. ## Fill it in Work down the form on site: - **Service details.** The date, the engineer, and why you attended (annual service, commissioning, breakdown or a follow-up). Your OFTEC numbers show here so you can see what will print. - **Client and property.** Prefilled if you started from the job. - **Appliances.** Add the appliance with its location, make and model, then the burner make, model and type, the tank and flue type, the fuel, and the nozzle size, angle and pattern. Most services are one appliance, but you can add more if the property has an oil cooker as well as a boiler. Each one gets its own checks and its own readings. - **Service checks.** Thirteen checks in two groups: the **Schedule** (oil storage, supply, air, flue, electrical safety, heat exchanger, combustion chamber, the burner rows and the safety controls) and the **Heating system service** (control check and hot water). Mark each Pass, Fail or N/A, with a note and a photo where it helps. The burner rows cover pressure jet and vaporising or wallflame separately, so mark the ones that do not apply as N/A. - **Readings.** Your analyser figures, grouped by burner, flue gas and hot water. **Every unit is written down for you**, so a reading of 9.5 can never be read back as the wrong thing later. Pump pressure is the one that gives you a choice, because oil pump gauges come in both: tap the **bar** next to the box to switch it to **psi**, and back. It records whichever you pick — it does not convert your number, so put in what the gauge in front of you says. The smoke number is the plain Bacharach figure, 0 to 9. Mucka nudges you if a reading looks well out of the usual range, but it never blocks you, because you are the one looking at the appliance. - **Commissioning.** Only fill this in if you commissioned the appliance on this visit. Tap **Add commissioning details** for the heat output, whether there is a CD/10 on file, and the building control reference if there is one. On a plain service, leave it alone. - **Important comments.** Any remedial work you are advising, in plain words. This prints on the certificate. - **Next service due.** Mucka suggests twelve months ahead. Change it if you need to. This is what puts the property back on your certificates-due list next year. - **Sign it off.** The engineer signs on screen. The customer can sign for receipt too, but they do not have to. Everything saves as you go, so you can put your phone down mid job and pick up where you left off, even on a different device. ## Approve and send Tap **Approve** when it is done. Mucka shows you the outcome and asks you to confirm. Approving **locks the record as a legal document** and generates the PDF. After that it cannot be edited, only corrected by issuing a replacement. Then tap **Send**. Mucka prefills the client from the property and attaches the PDF. Check the message, then send. ## What the certificate looks like One landscape page: your business details with your OFTEC registration, the property and client, then a block per appliance showing its details, the thirteen checks and every reading you took. Anything you marked Fail is listed in a defects panel, with your comments alongside. The Gas Safe mark does not appear, because this is an OFTEC document and Gas Safe has nothing to do with oil. ## More than one certificate on one visit Some visits raise two documents. A job type can say so, and then the job asks you for each of them. The clearest case is an installation: the **CD/10** completion report asks after a **TI/133D**, so a job type for putting a tank or boiler in can name both. In **Settings → Work → Job types**, edit the job type, pick the certificate it mainly produces, and tick anything else it raises under **Also produces**. From then on: - The job lists each one under what it still needs, on its own row, named properly. - Tapping a row opens **that** certificate. You are not sent to a list to find it again. - As you issue them the list gets shorter, so what is left on screen is what is left to do. - The Certificates page counts each one separately, so a job with one done and one outstanding still shows as owing it. It is not an oil-only idea and Mucka does not decide the pairings for you — you tick what your visits actually produce, because that varies by firm. ### When you finish one, Mucka offers the next If the job owes a second document, you do not have to go back to the job to find it. Approve the first and the **Certificate approved** screen offers it right there — above **Send to client**, because the paperwork that needs you on site beats the paperwork you can send from the van. Tapping it starts that certificate with what the two genuinely share already in: the date, your name, and the tank's make, type and serial number. A tank does not change between two forms filled in an hour apart. **Nothing you are meant to look at is filled in for you.** On a TI/133D that means all sixteen questions are blank and so are the three recommendations, for the reason at the top of this page: a wrong automatic answer on a fire risk assessment is worse than no answer. ## The other oil forms The CD/11 was the first of the five OFTEC forms in Mucka. The [CD/12 landlord oil safety check](/help/gas-certs/record-a-landlord-oil-safety-check), the [CD/10 installation completion report](/help/gas-certs/sign-off-an-oil-installation) and the [TI/133D tank risk assessment](/help/gas-certs/assess-an-oil-tank) have followed it, all in the **Oil** tab of the New Certificate list. Only the CD/14 warning notice is still to come. Ask Mucka about it and it will log that you are waiting on it.