Tempstar Heat Pump repair in Greater Vancouver
It usually happens on the first genuinely cold, wet week of the year. The Tempstar outdoor unit is running, you can hear it, but the air out of the registers is barely warm and the house is losing ground. Or the whole outdoor cabinet has turned into a block of white ice with the fan straining against it. Either way, something in the heating cycle has stopped doing its job.
Heat pumps in the Lower Mainland work harder than most people assume. Our winters are mild on paper but relentlessly damp, and a heat pump running near freezing in 90 percent humidity builds frost on the outdoor coil constantly. The defrost system is the single busiest subsystem on your Tempstar, and it is the first place a technician looks when heating drops off in January. Coastal homes closer to the water add a second problem — salt in the air chews at aluminum fins and copper connections over the years.
This page walks through how a technician actually diagnoses a Tempstar heat pump that has stopped heating, in the order the checks happen and why that order matters. There are a few things you can safely verify yourself in five minutes. Past that point, the work involves sealed refrigerant circuits, line voltage and high-pressure components, and it belongs to a licensed tech. HeatLand has been servicing heat pumps across Metro Vancouver and the Fraser Valley since 1999 — call (604) 330-3812.
Start with the three checks you can safely do yourself
Pull the filter. Hold it up to a light. If you cannot see light through it, that alone can explain weak heat, a short-cycling compressor, or an indoor coil that has frozen over. A restricted filter starves the indoor coil of airflow, and in heating mode that drives head pressure up until a safety cuts the compressor out. Filters in Lower Mainland homes load up fast in fall — cedar pollen, wood smoke, drywall dust from renovations.
Second, check power in two places, not one. A Tempstar split system has a breaker for the indoor air handler or furnace and a separate breaker plus an outdoor disconnect for the condenser. People find the indoor breaker on, assume power is fine, and never look at the disconnect box on the exterior wall. Open it and confirm the pull-out is fully seated.
Third, walk out and look at the outdoor unit. Clear snow, leaves, and blackberry growth back at least a foot on all sides, and make sure nothing is blocking the top discharge. Check that the base of the unit is not sitting in a pool of frozen meltwater — poor drainage under the pad is common on older Vancouver installs and it lets ice build from the bottom up. If any of these fixes it, great. If not, stop there and book a diagnostic.
Why the defrost cycle is the number one suspect in our climate
In heating mode the outdoor coil is the evaporator, so it runs colder than the outdoor air. At around 0 to 5 degrees with our humidity, moisture condenses on those fins and freezes. That is normal. Your Tempstar is designed to periodically reverse itself, run briefly in cooling mode to warm the outdoor coil, melt the frost off, and switch back. You will hear a distinct whoosh from the reversing valve and see steam rolling off the unit. That is the system working.
What fails is the initiation or the termination of that cycle. The board decides when to defrost based on inputs from a coil temperature sensor and either a timer or demand logic depending on the model generation. If the sensor drifts, loses contact with the tube it is clamped to, or its wiring corrodes — and salt air near Steveston, White Rock or the North Shore waterfront accelerates that — the board never gets the signal. Frost accumulates over days until the coil is encased.
The other failure is the reversing valve itself, or the solenoid coil that shifts it. If the valve will not shift, the unit calls for defrost but nothing warms up. A technician confirms this by watching line temperatures during a forced defrost, not by guessing. This is also why chipping ice off with a hammer is a bad idea — you will puncture a fin or a tube and turn a repair into a coil replacement.
How a technician sequences the diagnostic on a no-heat call
The order exists for a reason: cheap and non-invasive first, sealed system last. A tech starts at the thermostat and confirms there is actually a call for heat and that the wiring is intact — a rodent-chewed thermostat wire in a crawlspace produces symptoms that look exactly like a dead board.
Next is line voltage at the outdoor disconnect and at the contactor. Then control voltage. If the contactor is not pulling in, the question is whether the signal never arrived or whether the contactor itself has burned contacts, which is visible when you pull the cover — pitted, blackened points are unmistakable.
If the compressor tries to start and hums or trips, the run capacitor gets tested next. Capacitors are consumables and they fail more often than anything else in the outdoor cabinet. Only after electrical is cleared does a tech attach gauges and take suction and liquid pressures along with superheat and subcooling, cross-referenced against the outdoor temperature. That tells you whether the charge is right, whether there is a restriction, or whether the compressor is not pumping.
Any fault code the board is flashing gets read off the unit and checked against that specific model’s own diagnostic label inside the panel or its service manual. Code meanings vary between brands, model years and board revisions — nobody should be interpreting them from memory.
Ice on the outdoor unit: what it tells you and what to do right now
A light coating of frost on the coil in December is expected. A solid shell of ice covering the fan grille, the top of the cabinet, or the sides is not, and it means the unit has been failing to defrost for days.
Shut the system off at the thermostat. Do not run it in heating and hope it clears itself. If your Tempstar system has emergency or auxiliary heat, switch to that so the house stays warm while the ice melts and while you wait for service. Then let it thaw on its own, or speed it up with lukewarm water from a hose — never hot water, never a heat gun, never a screwdriver or hammer. Aluminum fins bend at almost nothing and the tubing behind them is thin-walled copper.
While it thaws, note where the ice started. Ice concentrated at the bottom of the unit usually means drainage — the base pan drain is plugged or the pad has settled so meltwater pools and refreezes. That is a common find under decks and in side yards on older Vancouver and Burnaby properties where the unit sits low. Ice spread evenly across the whole coil points at defrost control or a charge problem instead.
If the unit re-ices within a day or two of thawing, the root cause is still there. Get it diagnosed before the compressor takes the damage.
Weak heat, long run times, and short cycling
These three complaints have different causes and people mix them up constantly. Worth separating.
Weak but continuous heat, with the unit running fine, usually means reduced capacity: low refrigerant charge from a slow leak, a partially blocked indoor coil, a dirty outdoor coil, or a duct problem. Heat pumps deliver air that feels cooler than a gas furnace by nature — around body temperature rather than scalding — so some homeowners report weak heat when the system is performing normally. A tech settles that by measuring the temperature rise across the indoor coil rather than by feel.
Extremely long run times in genuinely cold weather can also be normal. A heat pump loses capacity as outdoor temperature drops, and during a Fraser Valley cold snap the balance point may fall below what the unit can carry alone, so it runs continuously and the auxiliary heat picks up the shortfall. If that is happening at 8 degrees rather than at freezing, something is wrong.
Short cycling — starting and stopping every few minutes — is the serious one. It points to a safety switch tripping repeatedly: high pressure from airflow restriction, low pressure from undercharge, or an overheating compressor. Every one of those cycles is hard on the compressor windings and start components. Keep the system off and book service rather than letting it hammer itself.
Salt air, damp crawlspaces and other Lower Mainland realities
Where the unit sits matters more here than in a dry climate. Systems within a few blocks of the water in White Rock, Tsawwassen, Steveston, Ambleside or Deep Cove show accelerated corrosion on the outdoor coil fins and on electrical terminals inside the cabinet. Green crust on lugs and copper is a service item, not cosmetic — a corroded connection creates resistance, heat and eventually a burned terminal.
Rinsing the outdoor coil with plain water a couple of times a year, fins-down and gently, slows salt corrosion meaningfully. Do it with the power off at the disconnect.
Indoors, a lot of Vancouver housing stock has air handlers or furnaces in unconditioned crawlspaces. Damp crawlspaces rust cabinets, encourage rodents to nest against warm equipment and chew low-voltage wire, and let ducts sweat. A no-heat call that turns out to be two severed thermostat wires under a house in Coquitlam is not unusual.
Strata and townhouse installs bring their own constraints. Outdoor units on balconies or in narrow walkways often have restricted airflow that was borderline from the day of install, and many stratas set noise limits and require approval before equipment is swapped or relocated. If a repair leads toward replacement, sort out the strata paperwork early rather than after the equipment is ordered. Permits through your municipality apply to equipment changeouts as well.
Repair or replace: the honest way to think about it
The deciding factors are the failed component, the age of the system, and the refrigerant it uses.
Capacitors, contactors, sensors, defrost boards, thermostats, fan motors and blower components are ordinary repairs on almost any system age. Nobody replaces a heat pump because a capacitor failed.
The conversation changes with a failed compressor or a leaking outdoor or indoor coil, especially on an older system. Those are the expensive parts, and if the unit uses an older refrigerant that is being phased down, obtaining it becomes harder over time and future repairs get less practical. A technician can tell you which refrigerant your Tempstar uses by reading the data plate — do not assume.
Repeat leaks are the clearest replacement signal. If a coil has been topped up more than once, adding refrigerant again is buying months, not years, and a leaking system runs low on charge which stresses the compressor.
We do not quote costs over the phone or online, because the honest answer depends on which part failed, access, whether the line set and electrical are reusable, and the condition of your ductwork. HeatLand provides a free written no-obligation estimate after a technician has actually seen the system. If replacement is on the table, ask about efficiency ratings for candidate models and check the manufacturer’s spec sheet or the AHRI listing for your exact configuration — and check current CleanBC and FortisBC program pages yourself for what is available, since program terms change.
Safety, certification, and what to book with HeatLand
If your home has any gas appliance in the mix — a gas furnace paired with the heat pump in a dual-fuel setup, a gas water heater in the same mechanical space, or a gas fireplace — treat gas symptoms as an immediate stop. If you smell gas or a carbon monoxide alarm sounds, get everyone out of the house first and call the gas utility and a licensed technician from outside. Do not go back in to investigate.
On the heat pump itself: never bypass or jumper a safety lockout to get the system running. Those switches trip because a pressure or temperature limit was exceeded, and forcing past them turns a repairable fault into a destroyed compressor. Refrigerant work requires certification, and gas work in BC requires a TSBC-certified gas fitter. HeatLand is licensed and insured, TSBC-certified for gas fitting, and services all major brands including Tempstar.
When you call, have three things ready: the model and serial number off the outdoor unit data plate, exactly what the system is doing and when it started, and any fault code or flashing light pattern you can see. That lets a technician arrive with the right likely parts on the truck instead of making two trips.
We serve Vancouver, Burnaby, Richmond, Surrey, Coquitlam, Langley, Delta, North and West Vancouver, New Westminster and the Fraser Valley. Call (604) 330-3812. Financing is available.
Quick Checklist
- Replace or clean the air filter and confirm you can see light through it before calling for service.
- Verify power at both the indoor breaker and the outdoor disconnect pull-out, not just one of them.
- Clear at least a foot of space around the outdoor unit and make sure the top discharge is unobstructed.
- Switch to emergency or auxiliary heat and shut the heat pump off if the outdoor coil is encased in ice.
- Write down the model and serial number from the outdoor data plate plus any flashing fault pattern.
- Stop and book a licensed technician for any refrigerant, compressor, sealed-system or gas-related symptom.
| Symptom you notice | What it usually points to | Homeowner or technician |
|---|---|---|
| Outdoor unit encased in ice, fan straining | Defrost cycle failing — sensor, control board or reversing valve | Shut off and switch to aux heat, then technician |
| Air from registers barely warm, unit runs constantly | Restricted airflow, dirty coil, or low refrigerant charge | Check filter yourself, then technician |
| System starts and stops every few minutes | A safety switch tripping on pressure or compressor temperature | Technician — keep the system off meanwhile |
| Outdoor unit hums but the compressor will not start | Failed run capacitor or burned contactor points | Technician — line voltage components |
| Nothing at all from the outdoor unit, indoor blower runs | Tripped breaker, unseated disconnect, or a broken low-voltage wire | Check breaker and disconnect, then technician |
Frequently Asked Questions
Why is my Tempstar heat pump blowing cool air in heating mode?
Two possibilities. The system may be in a normal defrost cycle, which briefly reverses to melt frost off the outdoor coil and can push cooler air for several minutes before returning to heat. If it stays cool for longer than that, the reversing valve may not be shifting into heating, the charge may be low, or the thermostat may be miswired after a recent replacement. If it persists past one cycle, have it diagnosed rather than letting the auxiliary heat carry the house.
Is frost on the outdoor unit normal in Vancouver winters?
A light, even coating of frost during cold damp weather is completely normal and your Tempstar is built to shed it periodically. What is not normal is thick ice covering the fan grille, the top of the cabinet, or the entire coil face, or frost that never clears between cycles. That means defrost is failing. Given our humidity, defrost components work harder here than in dry climates, and defrost faults are one of the most common Lower Mainland heat pump calls.
Can I pour hot water on the frozen outdoor unit?
No. Hot water can crack components and thermally shock the coil, and it refreezes fast in the base pan, making the ice problem worse. Lukewarm water from a garden hose is acceptable if you need to speed thawing, with the power off at the disconnect. Never use a heat gun, torch, hammer, screwdriver or ice scraper. The aluminum fins bend under almost no force and the copper tubing behind them punctures easily, which turns a repair into a coil replacement.
How much does a Tempstar heat pump repair cost?
It depends entirely on what failed and how accessible it is. A control component in the outdoor cabinet, a sealed-system refrigerant leak, and a compressor failure are three very different pieces of work. Access, the condition of the existing electrical and line set, and whether any permit-triggering work is involved all factor in too. HeatLand provides a free written no-obligation estimate once a technician has inspected the system, so you get a real number rather than a guess. Call (604) 330-3812.
What does the flashing light on my Tempstar mean?
Read the exact code or flash pattern off the unit and check it against the diagnostic label inside your unit’s own service panel or that specific model’s manual. Code meanings differ by brand, model and year, and even between board revisions of the same model, so anyone telling you a universal meaning is guessing. In broad terms, faults group into ignition, pressure, limit or overheat, airflow, sensor and communication categories, but only your unit’s own documentation confirms which.
Does living near the ocean affect my heat pump?
Yes, noticeably. Salt in coastal air corrodes the aluminum fins on the outdoor coil and attacks electrical terminals inside the cabinet, which over years reduces heat transfer and creates high-resistance connections that overheat. Homes in White Rock, Tsawwassen, Steveston and along the North Shore waterfront show this most. Rinsing the coil gently with plain water a couple of times a year, power off at the disconnect, slows it down. Annual service should include an inspection of terminals and fin condition.
Reviewed by the HeatLand Heating & Cooling team — licensed, insured, TSBC-certified HVAC contractor serving Metro Vancouver & the Fraser Valley since 1999. Error codes, specifications, pricing and rebate programs vary by model and change over time; confirm details against your unit’s own manual, a written quote, and the manufacturer or CleanBC/FortisBC. If you smell gas or your CO alarm sounds, leave the home and call the gas utility and a licensed technician from outside.