Radiant & Hydronic Heating Problems We Fix
Zone not heating — full zone diagnostic
Cold floor in one room or section only
Circulator pump failure and replacement
Zone valve replacement (motorized and manual)
Thermostat and zone controller issues
Air lock and bleeding hydronic systems
Manifold balancing and flow adjustment
Glycol concentration testing and flush
Expansion vessel recharge or replacement
System pressure loss diagnosis and repair
Boiler not triggering zone calls correctly
Multi-zone wiring and control board issues
Boiler Not Working Right Now?
Call directly for same-day emergency response across York Region. We carry common parts on the truck.
📞 647-699-2474Our Repair Process
- Zone mapping — we identify which zones are affected and how the system is configured (number of zones, boiler brand, thermostat type, manifold location).
- Pressure and flow check — we verify system pressure, check manifold flow indicators if present, and identify whether flow is reaching the affected zone.
- Electrical diagnostic — zone valves, thermostats, and zone controllers are tested. A zone valve that's not opening is the single most common cause of a cold zone.
- Pump and air check — we test circulator pump operation and check for air locks, which are common after system refills or glycol changes.
- Repair, balance, and test — after the repair, we re-balance the system, confirm all zones are calling and heating correctly, and verify boiler response.
Common Questions
Most common cause: a failed zone valve. Zone valves are motorized valves that open when a thermostat calls for heat — when the actuator fails (usually the motor or end switch), the valve stays closed and no hot water reaches that zone. Second most common: a stuck or seized manifold port on a manifold-based in-floor system. Both are straightforward repairs with the right parts on hand.
Almost certainly an air lock. When the system is drained and refilled — for a glycol change, pump replacement, or any repair that opens the system — air gets trapped in the tubing loops. Air pockets block flow and prevent zones from heating properly. We purge radiant systems using a fill-and-flush procedure on each zone individually. It takes time but it's essential.
Either there's a leak somewhere in the system (check under manifolds, at boiler connections, and around zone valves) or the expansion vessel has failed. A waterlogged expansion vessel can't absorb the pressure increase when the system heats up, causing the pressure relief valve to weep or the system to overpressure. We test expansion vessels with a simple gauge check and can recharge or replace them same visit.
Every 4–5 years is the industry standard, but it depends on system pH and inhibitor concentration. Degraded glycol becomes acidic and corrodes aluminum heat exchangers, copper tubing, and brass fittings from the inside out. We test with a refractometer (for concentration) and test strips (for pH and inhibitor level) — if either is out of spec, a flush and recharge is the right call.
Yes — we can assess your existing boiler capacity, manifold configuration, and tubing layout to determine whether adding a zone is feasible. Most York Region custom homes with multi-zone radiant have room for additional zones if the boiler was sized with expansion in mind. We handle the full installation: manifold tapping, zone valve, thermostat wiring, and balancing.
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G1 licensed, Navien and NTI certified. York Region's owner-operated boiler specialist — the tech who answers is the tech who shows up.
- ✓ G1 Licensed — all gas boiler work
- ✓ Navien & NTI factory certified
- ✓ All brands and boiler types
- ✓ Same-day for emergencies
- ✓ Upfront pricing — no surprises
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Free estimate — York Region