Diagnose it on the first trip.
Type the error code, model or symptom. OnCall Tech gives you what it means, what to test, the values to expect and the part that usually fails, plus an AI assistant that answers from our repair library instead of guessing.
Brand names identify appliances only. No affiliation or endorsement.
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Error codes decoded
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Field service manuals
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Step-by-step diagnostic guides
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Home appliance categories
The real cost
Diagnosis is where the profit leaks out.
Twenty minutes in the truck
Scrolling a 180-page PDF on a phone while the customer waits isn't diagnosis. It's unbilled time.
Chatbots invent error codes
Ask a general AI and it answers with confidence. Wrong code, wrong part, second trip.
Subscriptions that never stop
Pro repair tools commonly run $49+ a month. That's $588+ a year before you fix anything.
Step 3 of 7 · Expected value
Continuity · ~0 Ω
How it works
Four steps. About ninety seconds.
- 1
Tell it what you've got
Brand, model, code or symptom, typed the way you'd say it to another tech. Or snap the model label.
- 2
It pulls the right entry
OnCall Tech matches the code and the diagnostic guide for that appliance family before it answers.
- 3
Test with expected values
Ordered from most likely to least likely, with the reading you should see and what a bad reading means.
- 4
Confirm the part, get the manual
See the part that usually fails and jump straight to the manufacturer's official documentation.
Coverage
Every appliance a house runs on.
Browse by brand
Start with the name on the door.
A service manual for every platform you meet.
Samsung front-loaders, Whirlpool VMW top-loaders, LG linear fridges, gas and electric dryers, mini-splits, tank and tankless water heaters and more. How it works, what to test, what you should read on the meter, and what fails most. Written by us, printable as PDF.
- Sequence of operation, in plain English
- Component locations, tests and expected readings
- Service and test modes (when confirmed)
- Teardown notes and safety flags
- Common failures by symptom
What you get
Built for the truck, not the classroom.
An AI assistant that cites the library, not its imagination
Ask follow-ups like “already swapped the pump, what next?”. Answers come from OnCall Tech entries and link back to them. No verified data? It tells you, suggests safe generic checks, and points you to the official manual.
Snap the model label
Point your camera at the rating plate or the error display. The assistant reads brand, model and code for you.
Safety guardrails
High-voltage steps are flagged. Gas and sealed refrigerant systems are diagnosis-and-refer only (EPA 608).
Official manuals, one tap away
Direct links to each manufacturer's support and documentation pages, so you always confirm against the source.
Installs like an app
Add it to your home screen. Light, fast on weak signal, and guides you've opened work offline.
Pay once. Keep it.
The math over one year, compared with a typical monthly repair-tool subscription.
| Typical subscription | OnCall Tech | |
|---|---|---|
| Price | $49+/month | $34.90 once |
| First-year cost | $588+ | $34.90 |
| Error codes & diagnostic guides | ||
| AI assistant grounded in a library | ||
| Priced for part-timers & handymen | ||
| Install on phone, no app store | Varies | |
| Recurring charge |
Pricing
One price. Lifetime access.
OnCall Tech Lifetime
For techs, handymen and maintenance crews
$34.90one time
- Full repair library: every error code, diagnostic guide and field manual
- New codes and guides as we publish them
- Official manufacturer manual links
- AI assistant: 100 questions + 10 photo analyses per month, renewed monthly
- Saved history, favorites and job notes
- Installable web app for any phone
One-time payment · Secure checkout by Paddle · 14-day refund
Lifetime access to the OnCall Tech library (error codes, diagnostic guides, official-manual links) for as long as OnCall Tech is offered, plus the AI repair assistant with a monthly fair-use allowance of 100 questions and 10 photo analyses, renewed every month. One payment, no subscription, no auto-renewal.
Stop guessing. Start diagnosing.
One payment of $34.90. Every code, every guide, and an assistant in your pocket.